[1] FRIEDEL J K, MUNCH J C, FISCHER W R. Soil microbial properties and the assessment of available soil organic matter in a haplic Luvisol after several years of different cultivation and crop rotation[J]. Soil Biol Biochem, 1996, 28(4/5):479-488.
[2] 叶莹莹, 刘淑娟, 张伟, 等.喀斯特峰丛洼地植被演替对土壤微生物生物量碳、氮及酶活性的影响[J].生态学报, 2015, 35(21):6974-6982.

YE Yingying, LIU Shujuan, ZHANG Wei, et al. Dynamics of soil microbial biomass and soil enzyme activity along a vegetation restoration gradient in a karst peak-cluster depression area[J]. Acta Ecol Sin, 2015, 35(21):6974-6982.
[3] 蒲琴, 胡玉福, 何剑锋, 等.植被恢复模式对川西北沙化草地土壤微生物量及酶活性研究[J].水土保持学报, 2016, 30(4):323-328.

PU Qin, HU Yufu, HE Jianfeng, et al. Effect of vegetation restoration pattern on the soil microbial biomass and enzyme activity in desertification grassland of northwest Sichuan[J]. J Soil Water Conserv, 2016, 30(4):323-328.
[4] 王文锋, 李春花, 黄绍文, 等.不同施肥模式对设施菜田土壤酶活性的影响[J].应用生态学报, 2016, 27(3):873-882.

WANG Wenfeng, LI Chunhua, HUANG Shaowen, et al. Effects of different fertilization patterns on soil enzyme activities in greenhouse vegetable field[J]. Chin J Appl Ecol, 2016, 27(3):873-882.
[5] 李娟, 赵秉强, 李秀英, 等.长期不同施肥条件下土壤微生物量及土壤酶活性的季节变化特征[J].植物营养与肥料学报, 2009, 15(5):1093-1099.

LI Juan, ZHAO Bingqiang, LI Xiuying, et al. Seasonal variation of soil microbial biomass and soil enzyme activities in different long-term fertilizer regimes[J]. Plant Nutr Fertil Sci, 2009, 15(5):1093-1099.
[6] WANG Bing, XUE Sha, LIU Guobin, et al. Changes in soil nutrient and enzyme activities under different vegetations in the Loess Plateau area, Northwest China[J]. Catena, 2012, 92(3):186-195.
[7] ZHANG Liqiong, WEI Xiaorong, HAO Mingde, et al. Changes in aggregate-associated organic carbon and nitrogen after 27 years of fertilization in a dryland alfalfa grassland on the Loess Plateau of China[J]. J Arid Land, 2015, 7(4):429-437.
[8] 邰继承, 杨恒山, 范富, 等.播种方式对紫花苜蓿+无芒雀麦草地土壤碳密度和组分的影响[J].草业科学, 2010, 27(6):102-107.

TAI Jicheng, YANG Hengshan, FAN Fu, et al. Effects of sowing methods on soil carbon density and composition in the alfalfa and Bromus inermis pasture[J]. Pratacultural Sci, 2010, 27(6):102-107.
[9] RAIESI F, BEHESHTI B. Soil C turnover, microbial biomass and respiration, and enzymatic activities following rangeland conversion to wheat-alfalfa cropping in a semi-arid climate[J]. Environ Earth Sci, 2015, 72(12):5073-5088.
[10] 中国科学院南京土壤研究所.土壤理化分析[M].上海:上海科学技术出版社, 1978:196-211.
[11] MALHI S S, ZENTNER R P, HEIER K. Effectiveness of alfalfa in reducing fertilizer N input for optimum forage yield, protein concentration, returns and energy performance of bromegrass-alfalfa mixtures[J]. Nutr Cycl Agroecosys, 2002, 62(3):219-227.
[12] 赵彤, 闫浩, 蒋跃利, 等.黄土丘陵区植被类型对土壤微生物量碳氮磷的影响[J].生态学报, 2013, 33(18):5615-5622.

ZHAO Tong, YAN Hao, JIANG Yueli, et al. Effects of vegetation types on soil microbial biomass C, N, P on the Loess Hilly Area[J]. Acta Ecol Sin, 2013, 33(18):5615-5622.
[13] KARA O, BABUR E, ALTUN L, et al. Effects of afforestation on microbial biomass C and respiration in eroded soils of Turkey[J]. J Sustainable For, 2016, 35(6):385-396.
[14] ERKTAN A, CÉCILLON L, GRAF F, et al. Increase in soil aggregate stability along a Mediterranean successional gradient in severely eroded gully bed ecosystems:combined effects of soil, root traits and plant community characteristics[J]. Plant Soil, 2016, 398(1/2):121-137.
[15] JIANG Xiaojin, LIU Xiaoe, WANG Enheng, et al. Effects of tillage pan on soil water distribution in alfalfa-corn crop rotation systems using a dye tracer and geostatistical methods[J]. Soil Tilagel Res, 2015, 150:68-77.
[16] 张丽琼, 郝明德, 臧逸飞, 等.苜蓿和小麦长期连作对土壤酶活性及养分的影响[J].应用生态学报, 2014, 25(11):3191-3196.

ZHANG Liqiong, HAO Mingde, ZANG Yifei, et al. Effect of continuous cropping of wheat and alfalfa on soil enzyme activities and nutrients[J]. Chin J Appl Ecol, 2014, 25(11):3191-3196.
[17] BÖHME L, LANGER U, BÖHME F. Microbial biomass, enzyme activities and microbial community structure in two European long-term field experiments[J]. Agric Ecosyst Environ, 2005, 109(1/2):141-152.
[18] KATSALIROU E, DENG Shiping, NOFZIGER D L, et al. Long-term management effects on organic C and N pools and activities of C-transforming enzymes in prairie soils[J]. Eur J Soil Biol, 2010, 46(5):335-341.
[19] TU Chen, TENG Ying, LUO Yongming, et al. PCB removal, soil enzyme activities, and microbial community structures during the phytoremediation by alfalfa in field soils[J]. J Soils Sediments, 2011, 11(4):649-656.
[20] CHEN Hao, LI Dejun, ZHAO Jie, et al. Effects of nitrogen addition on activities of soil nitrogen acquisition enzymes:a meta-analysis[J]. Agric Ecosyst Environ, 2018, 252:126-131.