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红壤是中国南方地区重要的耕地资源,但红壤酸性程度高,养分较为匮乏,有机碳库存能力弱[1]。提高红壤有机碳稳定性和碳库储量对保障粮食安全、维护农业可持续发展以及减缓温室气体排放至关重要[2−3]。土壤有机碳库由不同化学结构与稳定性的有机碳组分构成,依据有机碳抗分解性及其对外界环境的敏感程度等特征,可将土壤有机碳组分划分为活性碳和惰性碳等碳组分[4]。例如,通过硫酸水解法可获得由微生物和植物来源的多糖及纤维素组成的活性碳组分,可较好地指示土壤有机碳的活跃性和生物可降解性[5]。因此,定量区分土壤碳组分质量分数变化对预测土壤碳库稳定性具有重要意义。有机物料还田是提升土壤有机质和作物产量的重要措施[6]。有研究表明:短期内秸秆和粪肥还田可以增加土壤活性有机碳质量分数,但也会导致土壤矿化作用增强,引起激发效应[7−10]。将有机物料热解成生物质炭并施加于土壤可显著增强土壤养分固持能力[11],提高土壤碳稳定性[2, 12],并降低土壤酸度[4, 13−14]。尽管已有较多关于有机物料与生物质炭单施对土壤养分和结构改良的研究,但两者配施对土壤碳组分与酶活性及其生态化学计量特征的影响还鲜见报道。
土壤酶是土壤有机质分解和养分循环的重要驱动力,在土壤碳(C)、氮(N)、磷(P)生物地球化学循环过程中发挥着关键作用[15]。近年来,随着生态化学计量学研究的深入,土壤酶的生态化学计量特征日益受到重视[16]。这是因为相比土壤酶活性,酶的生态化学计量特征可以更好地反映微生物的代谢需求及其与环境中养分有效性之间的生物化学平衡关系,是衡量土壤微生物能量和养分资源限制状况的重要指标[17]。常见的土壤酶包括与碳转化相关的β-葡萄糖苷酶(BG)和纤维二糖水解酶(CB);与氮转化相关N-乙酰-氨基葡萄糖苷酶(NAG)和亮氨酸氨基肽酶(LAP);与磷转化相关的酸性或碱性磷酸酶(PHOS)。目前,土壤酶生态化学计量特征研究多用(BG+CB)∶(NAG+LAP)∶PHOS比值来表征微生物对碳、氮、磷的需求状况[16]。研究表明:土壤酶C∶N∶P在全球尺度上相对稳定,约为1∶1∶1,当比值偏离时表明微生物受到碳、氮或磷的限制[18]。MOORHEAD等[19]和CUI等[20]发现:将这些酶活性比值转化为向量长度和向量角度,可以较好地表征土壤的碳、氮、磷限制状况。已有研究表明:土壤微生物养分限制状况与土壤有机质稳定性密切相关,当土壤微生物处于能量或养分限制时,可能促进或抑制有机质的分解,从而影响土壤碳排放[16]。陈浩宁等[21]研究表明:有机物料会促进土壤有机质分解来满足微生物生长需求,从而缓解微生物的能量和养分限制。与此相反,生物质炭施用提高了土壤惰性碳质量分数和氮固定能力,可能会增加微生物氮限制[22]。然而,由于有机物料和生物质炭类型、施用时间和土壤质地状况的差异,不同有机物料配施下微生物养分限制状况及其与土壤有机碳组分之间的关系还存在较大的不确定性,因此,研究不同有机物料施用后,土壤碳组分和酶生态化学计量特征的变化,对于促进旱地红壤微生物驱动的有机碳稳定性研究至关重要。
本研究以玉米Zea mays秸秆、羊粪单施及其与生物质炭配施2 a后的旱地红壤为田间试验对象,分析土壤有机碳组分以及碳、氮和磷获取相关酶活性变化,明确不同改良措施对旱地红壤微生物养分限制状况的影响及其主要驱动因子,以期为增加旱地红壤有机碳稳定性提供科学依据。
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研究区位于浙江省杭州市临安区锦北街道(30°15′N, 119°43′E)。该区属亚热带季风气候,全年降水量为1 420.0 mm,年平均气温为15.9 ℃,年总日照时数为1 774.0 h,无霜期为236.0 d。样地土壤为粉砂岩母质上发育的红壤。试验地土壤基本理化性质:pH为 4.74,有机碳为4.55 g·kg−1,全氮为0.45 g·kg−1,有效磷为1.58 mg·kg−1,速效钾为89.00 mg·kg−1,碱解氮为63.10 mg·kg−1。砂粒、粉粒和黏粒分别为10.4%、43.5%和46.1%。
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田间试验始于2017年4月,有机物料选取玉米秸秆和羊粪,共设置6个处理,包括:对照(ck,不施有机物料)、玉米秸秆单施(S)、羊粪单施(M)以及上述3种处理分别与生物质炭(B)配施(记为ck+B、S+B、M+B)。每处理设置3个重复,随机区组设计。小区面积为6.6 m2,小区间间距为0.5 m。本研究玉米秸秆采用全量还田,施用量为10.2 t·hm−2,其中含碳量为3.6 t·hm−2。羊粪和生物质炭的用量与玉米秸秆处理保持等碳量输入,施用量分别为33.5 t·hm−2和8.5 t·hm−2。为防止各小区土壤性质相互影响,每个小区都用60 cm宽的聚氯乙烯板包围并插入土壤40 cm。
所用生物质炭为玉米秸秆炭,由玉米秸秆在炭化炉450~500 ℃厌氧环境下热解2 h制备而成,并过2 mm筛,备用。生物质炭基本理化性质:pH 9.3,总碳为424.2 g·kg−1,全氮为10.2 g·kg−1,总磷为1.6 g·kg−1,总钾为2.6 g·kg−1,碳氮比为41.74。玉米秸秆于当地收集,自然风干后切碎至1 cm备用。玉米秸秆含全碳352.6 g·kg−1,全氮9.2 g·kg−1,碳氮比为38.32。试验所用羊粪购自当地饲养场,含水量为0.63 g·kg−1,pH 8.2,总碳为294.3 g·kg−1,全氮为21.7 g·kg−1,总磷为10.6 g·kg−1,总钾为11.2 g·kg−1。将生物质炭、玉米秸秆和羊粪按试验设计分别均匀撒在土壤表面,用锄头将物料与0~15 cm土壤均匀混合,试验期间每年种植玉米,未额外施用其他肥料。
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2018年12月,在各小区内按照五点法采集0~15 cm土壤,挑去石粒、根系以及植物残体等杂物,充分混匀后置于无菌塑封袋。每份混合样品过2 mm筛,并分成3份:1份保存于4 ℃冰箱,并在14 d内测定土壤微生物生物量和酶活性;1份经室温自然风干后,测定土壤化学性质;剩余部分冷冻干燥后,保存于−70 ℃冰箱。
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参考鲁如坤[23]的方法。土壤pH按土水比1.0∶2.5(质量比)用pH计(Mettler Toledo Seveneasy)测定;土壤有机碳(SOC)采用重铬酸钾外加热法测定;全氮(TN)用凯氏定氮法测定;土壤全磷(TP)用高氯酸-硫酸法测定;土壤有效磷(AP)采用碳酸氢钠浸提,分光光度法测定;土壤速效钾(AK)用火焰光度法测定;碱解氮(AN)用碱解扩散法测定。采用2步硫酸水解法测定易矿化碳组分和惰性碳组分[24]:称取过0.25 mm筛风干土壤样品0.5 g,用20 mL的2.5 mol·L−1硫酸在105 ℃下水解30 min,后用20 mL去离子水冲洗残留物,此时水解产物中的碳被定义为易矿化碳组分Ⅰ(LPⅠ-C);剩余残渣在室温下用13.0 mol·L−1 硫酸连续震荡水解12 h,并在105 ℃下保持3 h,定期摇匀,样品经5 000 r·min−1离心回收水解所得到的上清液,即得到易矿化碳组分Ⅱ(LPⅡ-C);惰性有机碳(RP-C)是土壤有机碳与易矿化碳组分的差值。其中,难降解组分占土壤总有机碳的比例即为难降解指数。土壤有机碳活性组分(LPC)占土壤总有机碳的比例即为有机碳活性指数[25]。
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本研究测定5种土壤水解酶活性,包括β-葡萄糖苷酶(BG)、纤维二糖水解酶(CB)、β-N-乙酰基氨基葡萄糖苷酶(NAG)、亮氨酸氨基酞酶(LAP)、酸性磷酸酶(PHOS)。土壤水解酶活性测定参照SAIYA-CORK等[26]方法。将混有酶和底物混合物的微孔板放入25 ℃培养箱中黑暗培养3 h,并用微板荧光计测定荧光裂解产物4-甲基伞形花基(MUB)或4-甲基香豆素(MUC)的产量,测定时激发波长为365 nm,发射波长为450 nm。所有酶活性均以nmol·g−1·h−1表示。根据DEFOREST[27]的方法,以L-3,4-二羟基苯丙氨酸(L-DOPA)为底物,微孔板分光光度法分析多酚氧化酶(PHOX)和过氧化物酶(PERO)活性。根据酶活性比例计算向量长度(vector length,Lv)和向量角度(vector angle,Av),分别用以表征微生物的碳限制和养分限制状况[28]。
$$ {L}_{{\rm{V}}}=\sqrt{{X}^{2}+{Y}^{2}} ;$$ $$ \quad\;\;\; {A}_{{\rm{V}}}=\mathrm{a}\mathrm{r}\mathrm{c}\mathrm{t}\mathrm{an}(X/Y) 。$$ 其中:X表示碳、磷获取酶的相对活性,即(EBG+ECB)/(EBG+ECB+EPHOS);Y表示碳、氮获取酶的相对活性,即(EBG+ECB)/(EBG+ECB+ENAG+ELAP)。较长的向量长度表示较大的碳限制,向量角度<45°和>45°分别表示氮和磷限制;微生物碳限制随向量长度的增加而增加,微生物磷限制随向量角度的增大而增大,微生物氮限制随向量角度的增大而减小[28]。
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采用SPSS 26.0以有机物料(OF)、生物质炭(BF)作为因子,进行双因素方差分析(two-way ANOVA),检验有机物料和生物质炭施用间的土壤性质差异及互作效应;单因素方差分析(one-way ANOVA)和Duncan法多重比较检验不同处理间差异显著性,显著性水平设为P<0.05;土壤酶活性及化学计量比与土壤化学性质的冗余分析(RDA)采用Canoco 4.5软件;采用皮尔逊(Pearson)相关分析法分析相关性,进行双尾检验确定显著性。
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与ck相比,单施羊粪显著提高土壤pH和养分质量分数,单施秸秆显著增加了土壤氮磷比,单施生物质炭显著增加了土壤有机碳和速效钾质量分数,并提高了土壤碳氮比和碳磷比(表1)。与单施有机物料相比,有机物料与生物质炭配施显著增加了土壤有机碳和速效氮质量分数,提高了土壤碳氮比和碳磷比。与单施秸秆相比,秸秆与生物质炭配施显著增加了土壤全氮和速效钾质量分数(P<0.05)。双因素方差分析表明:有机物料施用对土壤化学性质有显著影响,生物质炭对土壤化学性质(除全氮和全磷外)、碳氮比和碳磷比有显著影响,但两者无显著交互作用。
表 1 生物质炭配施有机物料对土壤化学性质的影响
Table 1. Effects of biochar combined with organic materials on soil chemical properties
处理 pH 有机碳/(g·kg−1) 全氮/(g·kg−1) 全磷/(g·kg−1) 速效氮/(mg·kg−1) ck 4.94±0.22 c 4.54±0.17 d 0.62±0.06 c 0.21±0.05 b 45.35±3.61 d S 5.16±0.27 bc 5.15±0.84 d 0.73±0.07 bc 0.18±0.01 b 48.76±3.48 d M 5.54±0.08 ab 7.23± 0.84 c 0.99±0.23 a 0.31±0.07 a 58.88±6.64 bc ck +B 5.26±0.27 bc 11.02±0.85 b 0.72±0.04 bc 0.20±0.01 b 50.50±5.23 cd S+B 5.29±0.20 bc 12.02±1.27 ab 0.87±0.11 ab 0.21±0.02 b 60.77±8.53 b M+B 5.80±0.14 a 13.13±0.77 a 0.92±0.07 ab 0.29±0.01 a 71.57±1.57 a OF 12.56** 12.28** 9.20** 15.08** 15.90** BF 5.79* 254.42*** 1.12 0.15 15.55** OF×BF 0.28 0.50 1.30 0.78 0.91 处理 有效磷/(mg·kg−1) 速效钾/(mg·kg−1) 碳氮比 碳磷比 氮磷比 ck 2.95±0.79 c 100.44±32.71 c 7.39±0.72 b 22.84±3.94 c 3.17±0.80 c S 4.08±1.11 bc 108.42±33.18 c 6.98±0.40 b 28.65±2.33c 4.10±0.10 a M 8.89±1.61 a 219.70±40.56 ab 7.55±1.40 b 24.27±4.00 c 3.23±0.11 bc ck+B 4.30±0.76 bc 166.69±27.42 b 15.27±1.09 a 55.59±5.31 a 3.64±0.22 abc S+B 5.69±1.95 b 193.56±13.86 b 13.90±0.92 a 55.93±3.30 a 4.03±0.17 ab M+B 10.10±0.21 a 251.18±13.40 a 14.33±1.65 a 44.64±3.28 b 3.13±0.12 c OF 38.76*** 21.64*** 0.65 4.30 6.78* BF 5.93* 20.31** 126.25** 148.75** 0.23 OF×BF 0.04 1.35 0.29 2.66 0.81 说明:ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010;***. P<0.001。 -
与ck相比,单施羊粪和生物质炭显著增加了易矿化组分Ⅰ、惰性有机碳质量分数;相比单施有机物料,生物质炭与有机物料配施显著增加了土壤惰性有机碳质量分数,降低有机碳活性指数,提高了有机碳难降解指数(表2)。双因素方差分析表明:有机物料或生物质炭施用对土壤惰性有机碳质量分数有极显著影响(P<0.01),而生物质炭对难降解指数和有机碳活性指数有极显著影响(P<0.01)。
表 2 生物质炭配施有机物料对土壤碳组分的影响
Table 2. Effects of biochar combined with organic materials on soil carbon fractions
处理 易矿化碳组分Ⅰ/(g·kg−1) 易矿化碳组分Ⅱ/(g·kg−1) 惰性有机碳/(g·kg−1) 难降解指数/% 有机碳活性指数/% ck 1.16±0.08 b 1.45±0.08 ab 1.92±0.13 d 42.28±1.37 c 58.72±1.37 a S 1.47±0.18 ab 1.91±0.29 a 1.77±0.69 d 33.45±7.78 c 66.55±7.78 a M 1.68±0.24 a 1.70±0.41 ab 3.85±0.49 c 53.31±4.54 b 46.69±4.54 b ck+B 1.56±0.34 a 1.27±0.23 b 8.19±1.26 b 74.03±6.61 a 25.97±6.61 c S+B 1.58±0.06 a 1.74±0.25 ab 8.70±1.17 ab 72.26±2.89 a 27.74±2.89 c M+B 1.55±0.08 a 1.60±0.46 ab 9.98±1.28 a 75.85±5.21 a 24.15±5.21 c OF 2.76 3.32 7.14** 7.65 7.65 BF 1.81 1.03 210.61** 160.25** 160.25** OF×BF 2.83 0.02 0.31 3.69 3.69 说明:ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010。 -
与ck相比,单施羊粪显著提高β-葡萄糖苷酶活性94.5%、β-N-乙酰基氨基葡萄糖苷酶活性179.2%、过氧化物酶活性39.8%;单施秸秆显著提高β-葡萄糖苷酶活性79.6%和过氧化物酶活性48.6% (表3)。与单施秸秆相比,生物质炭配施羊粪显著降低多酚氧化酶活性28.6%、过氧化物酶活性22.2%;与单施羊粪相比,生物质炭配施羊粪降低β-葡萄糖苷酶活性50.9%、亮氨酸氨基肽酶活性32.1%、β-N-乙酰基氨基葡萄糖苷酶活性45.3%、酸性磷酸酶活性40.0%、过氧化物酶活性31.3%。双因素方差分析表明:生物质炭施用对β-葡萄糖苷酶、多酚氧化酶和过氧化物酶活性有显著影响;有机物料施用对纤维素二塘水解酶、β-N-乙酰基氨基葡萄糖苷酶和过氧化物酶活性有显著影响;生物质炭配施有机物料对β-葡萄糖苷酶和酸性磷酸酶活性有显著的交互作用。
表 3 生物质炭配施有机物料对土壤水解酶和氧化酶活性的影响
Table 3. Effects of biochar combined with organic amendments on soil hydrolase and oxidase activities
处理 BG CB LAP NAG PHOS PHOX PERO ck 9.13±3.91 c 1.64±0.27 bc 3.11±0.62 ab 3.63±1.12 b 55.27±13.41 ab 709.47±61.41 ab 1 741.86±341.52 cd S 16.41±2.00 ab 2.64±0.61 ab 3.42±0.69 ab 4.29±1.75 b 49.90±10.89 ab 875.67±97.78 a 2 588.16±279.97 a M 17.76±3.42 a 2.16±0.68 abc 4.03±0.49 a 10.15±4.31 a 73.04±17.17 a 699.29±202.40 ab 2 435.79±129.12 ab ck+B 10.56±2.70 c 1.16±0.75 c 3.36±0.90 ab 4.88±2.88 b 70.88±7.07 a 489.06±79.10 b 1 433.27±258.45 d S+B 11.47±1.39 bc 3.06±0.85 a 3.26±0.36 ab 4.45±0.83 b 58.40±2.66 ab 625.15±172.36 b 2 014.58±133.39 bc M+B 8.73±3.67 c 1.22±0.47 c 2.73±0.53 a 5.55±2.62 b 43.85±15.84 b 598.55±67.76 b 1 672.53±371.10 cd OF 3.22 8.72** 0.09 3.88* 0.80 2.25 10.90** BF 8.82* 1.24 1.88 0.79 0.09 10.37** 18.72** OF×BF 4.67* 1.78 2.48 2.24 5.79* 0.60 1.08 说明:酶活性单位. nmol·g−1·h−1。BG. β-葡萄糖苷酶;CB. 纤维素二塘水解酶;LAP. 亮氨酸氨基肽酶;NAG. β-N-乙酰基氨基葡萄糖苷酶;PHOS. 酸性磷酸酶;PHOX.多酚氧化酶;PERO. 过氧化物酶。ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010。 与ck相比,单施秸秆显著提高了酶碳氮比、酶碳磷比和向量长度,而单施羊粪对酶碳氮比、酶碳磷比和向量长度无显著影响(图1)。与单施秸秆相比,生物质炭配施秸秆显著降低了酶碳磷比;与单施羊粪相比,生物质炭配施对酶化学计量比、向量长度及向量角度均无显著影响。双因素方差分析表明:生物质炭施用对酶碳磷比有显著影响,有机物料施用对酶碳氮比、酶碳磷比、向量长度和角度有显著影响,但两者无显著的交互作用。
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冗余分析结果显示:土壤化学性质对土壤酶活性及其化学计量比的解释度为79.1%,第1轴解释了变量的74.3%,第2轴解释了变量的4.7% (图2)。土壤易矿化碳组分Ⅱ(F=8.69, P=0.012)、土壤碳氮比(F=7.47, P=0.022)、土壤碳磷比(F=6.64, P=0.012)和土壤惰性有机碳 (F=6.15, P=0.018)是显著影响土壤酶活性及化学计量比的环境因子,其解释率分别为35.0%、32.0%、29.0%、28.0%。土壤多酚氧化酶和过氧化物酶与土壤碳氮比、土壤碳磷比、土壤有机质、土壤惰性有机碳呈负相关,但与土壤易矿化碳组分Ⅱ呈显著正相关。向量长度与土壤碳氮比、土壤碳磷比、土壤有机质、土壤惰性有机碳呈显著负相关。
Effects of biochar combined with organic amendments on carbon composition and eco-enzymatic stoichiometry of red soil
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摘要:
目的 分析生物质炭和有机物料施用对旱地红壤有机碳组分和酶活性的影响,探明微生物的碳氮磷元素限制特征,为提升红壤有机碳稳定性提供理论依据。 方法 采用田间试验,设置不施有机物料对照(ck)、玉米Zea mays秸秆单施、羊粪单施及其分别与生物质炭(玉米秸秆炭)配施等6个处理。试验开始2 a后测定土壤有机碳组分、土壤养分质量分数、碳氮磷循环相关碱解酶活性和氧化酶活性。 结果 与单施秸秆和羊粪相比,生物质炭与有机物料配施显著增加了土壤有机碳和碱解氮质量分数(P<0.05),提高了土壤碳氮比和碳磷比及惰性碳组分质量分数,降低了有机碳活性指数。有机物料施用显著提高了纤维二糖水解酶(CB)、β-1,4-N-乙酰氨基葡萄糖苷酶(NAG)和过氧化物酶(PERO)活性(P<0.05);与单施羊粪相比,生物质炭与羊粪配施处理显著降低β-葡萄糖苷酶(BG)活性50.9%、亮氨酸氨基肽酶(LAP)活性32.1%、NAG活性45.3%、酸性磷酸酶(PHOS)活性40.0% (P<0.05)。与单施秸秆相比,生物质炭与秸秆配施降低了多酚氧化酶(PHOX)活性28.6%和PERO活性22.2%,但对其他酶的活性无影响。与单施秸秆相比,生物质炭配施秸秆降低了向量长度;与单施羊粪相比,生物质炭配施羊粪对酶化学计量比、向量长度及向量角度均无显著影响。PERO和PHOX与土壤惰性碳质量分数、碳氮比、碳磷比呈显著负相关(P<0.05)。冗余分析表明:土壤惰性碳质量分数、碳氮比和碳磷比是影响土壤酶活性及其化学计量特征的主要因子。 结论 与有机物料单施相比,生物质炭与有机物料配施可以更好地提高旱地红壤养分和惰性碳组分质量分数,降低有机碳分解酶活性,缓解碳磷限制,可作为改善红壤微生物养分限制和提高碳汇能力的有效措施。图2表3参 44 Abstract:Objective The objective is to analyze the effects of biochar and organic amendments application on organic carbon composition and enzyme activities of red soil in arid areas, and investigate limiting characteristics of microbial nutrients, so as to provide a theoretical basis for improving the stability of red soil organic carbon. Method A field experiment with 6 treatments were set up, including a non-amendment control (ck), corn (Zea mays) straw and sheep manure single application and their combination with biochar (corn straw biochar). 2 years after the start of the experiment, soil organic carbon components, soil nutrient mass fraction, hydrolase activities and oxidase activities related to carbon, nitrogen and phosphorus cycling were determined. Result Compared with the single application of straw and sheep manure, the combination of biochar and its application significantly increased the mass fraction of soil organic carbon and available nitrogen (P<0.05), increased the soil carbon-nitrogen ratio (C∶N), carbon-phosphorus ratio (C∶P) and the mass fraction of recalcitrant carbon pools, and reduced soil organic carbon activity index. The application of organic amendments significantly increased the activities of β-D-cellobiosidase hydrolase (CB), β-1,4-N-acetylglucosacosidase (NAG) and peroxidase (PERO) (P<0.05). Compared with the single application of sheep manure, the combined application of biochar and sheep manure significantly reduced the β-glucosidase (BG) activity, leucine aminopeptidase (LAP) activity, NAG activity and acid phosphatase (PHOS) activity (by 50.9%, 32.1%, 45.3% and 40.0%, respectively, P<0.05). Compared with the single application of straw, the combined application of biochar and straw reduced the activity of polyphenol oxidase (PHOX) by 28.6% and PERO activity by 22.2%, but had no effect on the activity of other enzymes. Compared with the single application of straw, the combination of biomass charcoal and straw reduced the vector length. Compared with applying sheep manure alone, the combination of biomass charcoal and sheep manure had no significant effect on enzyme stoichiometry, vector length, and vector angle (P<0.05). PERO and PHOX were significantly negatively correlated with soil recalcitrant carbon pools, C∶N and C∶P (P<0.05). Redundant analysis showed that soil recalcitrant carbon pools, C∶N and C∶P were the main factors affecting soil enzyme activity and its stoichiometric characteristics. Conclusion Compared with the single application of organic materials, the combined application of biochar and sheep manure can better improve the nutrient and the size of recalcitrant carbon fraction in red soil in arid cropland, reduce the activity of carbon degrading enzymes, and alleviate microbial carbon and phosphorus limitation, and can be an effective measure to improve the microbial nutrient limitations and carbon sequestration capacity in red soil. [Ch, 2 fig. 3 tab. 44 ref.] -
Key words:
- red soil /
- organic amendments /
- biochar /
- carbon components /
- enzyme activity
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表 1 生物质炭配施有机物料对土壤化学性质的影响
Table 1. Effects of biochar combined with organic materials on soil chemical properties
处理 pH 有机碳/(g·kg−1) 全氮/(g·kg−1) 全磷/(g·kg−1) 速效氮/(mg·kg−1) ck 4.94±0.22 c 4.54±0.17 d 0.62±0.06 c 0.21±0.05 b 45.35±3.61 d S 5.16±0.27 bc 5.15±0.84 d 0.73±0.07 bc 0.18±0.01 b 48.76±3.48 d M 5.54±0.08 ab 7.23± 0.84 c 0.99±0.23 a 0.31±0.07 a 58.88±6.64 bc ck +B 5.26±0.27 bc 11.02±0.85 b 0.72±0.04 bc 0.20±0.01 b 50.50±5.23 cd S+B 5.29±0.20 bc 12.02±1.27 ab 0.87±0.11 ab 0.21±0.02 b 60.77±8.53 b M+B 5.80±0.14 a 13.13±0.77 a 0.92±0.07 ab 0.29±0.01 a 71.57±1.57 a OF 12.56** 12.28** 9.20** 15.08** 15.90** BF 5.79* 254.42*** 1.12 0.15 15.55** OF×BF 0.28 0.50 1.30 0.78 0.91 处理 有效磷/(mg·kg−1) 速效钾/(mg·kg−1) 碳氮比 碳磷比 氮磷比 ck 2.95±0.79 c 100.44±32.71 c 7.39±0.72 b 22.84±3.94 c 3.17±0.80 c S 4.08±1.11 bc 108.42±33.18 c 6.98±0.40 b 28.65±2.33c 4.10±0.10 a M 8.89±1.61 a 219.70±40.56 ab 7.55±1.40 b 24.27±4.00 c 3.23±0.11 bc ck+B 4.30±0.76 bc 166.69±27.42 b 15.27±1.09 a 55.59±5.31 a 3.64±0.22 abc S+B 5.69±1.95 b 193.56±13.86 b 13.90±0.92 a 55.93±3.30 a 4.03±0.17 ab M+B 10.10±0.21 a 251.18±13.40 a 14.33±1.65 a 44.64±3.28 b 3.13±0.12 c OF 38.76*** 21.64*** 0.65 4.30 6.78* BF 5.93* 20.31** 126.25** 148.75** 0.23 OF×BF 0.04 1.35 0.29 2.66 0.81 说明:ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010;***. P<0.001。 表 2 生物质炭配施有机物料对土壤碳组分的影响
Table 2. Effects of biochar combined with organic materials on soil carbon fractions
处理 易矿化碳组分Ⅰ/(g·kg−1) 易矿化碳组分Ⅱ/(g·kg−1) 惰性有机碳/(g·kg−1) 难降解指数/% 有机碳活性指数/% ck 1.16±0.08 b 1.45±0.08 ab 1.92±0.13 d 42.28±1.37 c 58.72±1.37 a S 1.47±0.18 ab 1.91±0.29 a 1.77±0.69 d 33.45±7.78 c 66.55±7.78 a M 1.68±0.24 a 1.70±0.41 ab 3.85±0.49 c 53.31±4.54 b 46.69±4.54 b ck+B 1.56±0.34 a 1.27±0.23 b 8.19±1.26 b 74.03±6.61 a 25.97±6.61 c S+B 1.58±0.06 a 1.74±0.25 ab 8.70±1.17 ab 72.26±2.89 a 27.74±2.89 c M+B 1.55±0.08 a 1.60±0.46 ab 9.98±1.28 a 75.85±5.21 a 24.15±5.21 c OF 2.76 3.32 7.14** 7.65 7.65 BF 1.81 1.03 210.61** 160.25** 160.25** OF×BF 2.83 0.02 0.31 3.69 3.69 说明:ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010。 表 3 生物质炭配施有机物料对土壤水解酶和氧化酶活性的影响
Table 3. Effects of biochar combined with organic amendments on soil hydrolase and oxidase activities
处理 BG CB LAP NAG PHOS PHOX PERO ck 9.13±3.91 c 1.64±0.27 bc 3.11±0.62 ab 3.63±1.12 b 55.27±13.41 ab 709.47±61.41 ab 1 741.86±341.52 cd S 16.41±2.00 ab 2.64±0.61 ab 3.42±0.69 ab 4.29±1.75 b 49.90±10.89 ab 875.67±97.78 a 2 588.16±279.97 a M 17.76±3.42 a 2.16±0.68 abc 4.03±0.49 a 10.15±4.31 a 73.04±17.17 a 699.29±202.40 ab 2 435.79±129.12 ab ck+B 10.56±2.70 c 1.16±0.75 c 3.36±0.90 ab 4.88±2.88 b 70.88±7.07 a 489.06±79.10 b 1 433.27±258.45 d S+B 11.47±1.39 bc 3.06±0.85 a 3.26±0.36 ab 4.45±0.83 b 58.40±2.66 ab 625.15±172.36 b 2 014.58±133.39 bc M+B 8.73±3.67 c 1.22±0.47 c 2.73±0.53 a 5.55±2.62 b 43.85±15.84 b 598.55±67.76 b 1 672.53±371.10 cd OF 3.22 8.72** 0.09 3.88* 0.80 2.25 10.90** BF 8.82* 1.24 1.88 0.79 0.09 10.37** 18.72** OF×BF 4.67* 1.78 2.48 2.24 5.79* 0.60 1.08 说明:酶活性单位. nmol·g−1·h−1。BG. β-葡萄糖苷酶;CB. 纤维素二塘水解酶;LAP. 亮氨酸氨基肽酶;NAG. β-N-乙酰基氨基葡萄糖苷酶;PHOS. 酸性磷酸酶;PHOX.多酚氧化酶;PERO. 过氧化物酶。ck. 对照;S. 秸秆处理;M. 羊粪处理; B. 添加生物质炭处理。OF. 有机物料因子;BF. 生物质炭因子;OF×BF. 有机物料与生物质炭的交互效应。表中数值为平均值±标准差。同列不同字母表示不同处理间差异显著(P<0.05)。双因素方差分析*. P<0.050;**. P<0.010。 -
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