1994 Vol. 11, No. 3

Long-term Seed Storage of Eight Main Forest Species (Cunninghamia lanceolata, Pinus massoniana, etc.) in Southern China.
Sun Hongyou, Cai Kexiao, Wu Zuying, Xu Weinan, Liang Jianying.
1994, 11(3): 223-234.
Eleven-twelve-year studies with seed storage from Cunninghamia lanceolata, Pinus massoniana, Cryptomeria fortunei, Pinus taiwanensis, Cupressus funebris, Pseudolarix amabilis, Toona sinensis and Casuarina equisetifolia, suggests the suitable temperature and the good moisture content for long-term seed storage of all forest species above mentioned, gives the effects and the vigor life under the combinations between different storage temperatures and various moisture contents of seeds. The seedlings cultured with long-term stored seeds were normal in growth and development, however the plant preservation percentage was smally down.
Studies on Organic Compounds in Rhizosphere Soil of Chinese fir and Chinese Sassafras
Jiang Peikun, Jiang Qiuyi, Xu Qiufang, Qian Xinbiao, Zhang Qinxiang.
1994, 11(3): 235-240.
The total amount of various organic compounds in the rhizosphere soil is higher than that in the bulk soil, whether in Chinese fir or Chinese sassafras. The value of C/N (of H/F) in the rhizosphere soil of Chinese fir is higher by 1.68 (lower by 0.23) than that in the rhizosphere soil of Chinese sessafras. The amount of total carbohydrate, soluble reducing carbohydrate and organic acid in the rhizosphere soil of Chinese fir is greater than that in the rhizosphere soil of Chinese sassafras, but it is a different case with amino acid and free amino acid. There is no remarkable difference of total phenol between rhizosphere soil of Chinese fir and that of Chinese sassafras, except that the rhizospheresoil of Chinese fir has a greater amount of free phenol. In bulk soil, Chinese fir succession can result in a decline in total organic compounds, total N and H/F, but an increase in total phenol and free phenol. Except an increase of free phenol in the rhizosphere soil of the second planting Chinese fir, the difference of other compounds is not striking in the rhizophere soil of first and second planting Chinese fir.
Study on Root Exudates of Chinese Fir Seedling Using Carbon 14.
Jiang Peikun, JiangQiuyi, Xu Qiufang, Qian Xinbiao, Jin Lei.
1994, 11(3): 241-246.
[Abstract](1101) [PDF](25)
By feeding carbon 14 to one year Chinese fir and collecting root exudates periodly, the results showed that 1.06%, 4.90% and 24.04% of the photosynthates were transported to the root 24, 72 and 480 hours after feeding respectively. The root exudate with carbon 14 were detected as soon as the labeling was finished. The summit of exudating occured 72~120 hours after feeding, afterwards, reducing with time. By separating and determining, the exudates contained 39.52 of carbohydrates, 13.80% of organic acid and 5.45% of amino acid.
Contents of Mineral Elements in Leaves and Fruits or Peach
Dai Wensheng, Wang BaiPo, Qian Yincai.
1994, 11(3): 247-252.
This paper analyses the contents of mineral elements in leaves and fruits of Gangshanzhaosheng peach and Yulu peaeh. The results indicate that the contents of 9 trace elements contained in the leaves are arranged as follows (from high to low): Fe, Mn, AI, Ba, B, Sr, Zn, Cu and Mo. The contents of Mg, Fe, AI, Mn, Ba, Sr and Mo increase gradually but Zn decreases in the leaves from the expasion period of leaves to the mature period of fruits. In fruits, the content sequence of these elements is as the same as that in the leaves except the content of AI is higher than that of Mn. The decreses of Mg and Zn contents and the increases of Fe, AI, Mn, Ba and Sr contents of fruits occur in the mature period of fruits, and the most obvious increases of Fe, AI, Mn, Ba and Sr contents appear over 10 days before fruit maturing. In the leaves of 2 varieties, the arrangement sequence of element contents is the same, but there isnt significant difference between element contents.
Density of Nursery Stock by Seedling of Magnolia biloba.
Pan XinPing, Si Jinping, Liu Rao, Mei Xiaolin.
1994, 11(3): 253-257.
This paper analyses the correlative relationship between the density of seedlings of Magnolia biloba on seed-bed and their growth indexes, such as diameters at base, hights, rhizotaxies and leaf areas of the seedlings, and proposes that the optimal density be 257 thousands per hectare.
Flowering Techniques of Gladiolus hybridus in winter.
Yang Zaikun, Shen Chaodong, Xu Xiaohua, Zhang Yinchao
1994, 11(3): 258-263.
The study indicates that some techniques should be used in order to make Gladiolus hybridus flower in winter, and they include corm selection, corm refrigeration, transitional planting in culture pan, planting time, appropriate temperature and illumination and improving field management. These techniques ensure a blooming period lasting from November to February, with a blooming ratio of 90 percent. The flowers are of good quality.
Composition of Lei Bamboo Rhizomatic System
Hu Chaozong, Jin Aiwu, Zheng Jianxin
1994, 11(3): 264-268.
[Abstract](1252) [PDF](22)
Lei bamboo had 5.6 rhizomes per square metre, and their length was 9.6m per square metre and volume 4.710-4m3 persquare metre. Over 80.0 percent of the rhizomes were distributed at depth of 11 to 40 cm and the number of rhizomes at 2~4-year-old accounted for 85.0 percent of the total rhizomes. The great part of sound buds making up 31.1 percent of the total buds appeared on the rhizomes at the age of 3~4 years on which 70.0~80.0 percent of bamboo sprouts could be developed in the same year. At the middle of rhizomes (joint 6~15), there were 58.7 percent of sound buds and 70.1 percent of bamboo sprouts, and the rhizomes generally branched near the tip (joint 1~6). The rhizomes growing upwards and parallel to bamboo forest land accounted for 80.0 percent of total rhizomes. The development of rhizomes was good in fertile, loose and ventilating soil with good function of water absorption and fertility preservation, and the rhizomatic composition could be rationally made in bamboo forests with the density 10000~11000 stocks per hectare.
Growth in weight of phyllostechys puhescens.
Lou Chong, Liu Chenglin.
1994, 11(3): 269-273.
Dased on the data about individual sprout and young bamboo growth in weight at the age of 1 to 13 collected from the experimental plots, the laws of moisture content, unit weight and dry weight were systemtically studied. The results showed that there were close relationships among moisture content, unit weight and ages, meanwhile the law of sprout and bamboo growth in weight could be fitted with mathematical expressions.
Ma Lingfei, Han Hong, Ma Naixun
1994, 11(3): 274-280.