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作 者 ：冯宗炜, 陈楚莹, 王开平, 张家武, 曾士余, 赵吉录, 邓仕坚

期 刊 ：植物生态学报 1985年 9卷 4期 页码：245-256

关键词：杉木；

摘 要 ：本文是1980--1983年本所湖南会同森林生态实验站成年杉木纯林中进行定位研究根据所取得的观测资料，分析和论述了营养元素在林内的积累与分配；以及从降雨中的输入量，计算了营养元素的年吸收量和归还量。研究表明，杉木纯林在21--23年生时，即达到主伐年龄期，营养元素年吸收量仍大于归还量，整个林分还处在养分消耗阶段。

Abstract:

The accumulation, distribution and cycling of nutrient, elements were studied in a mature (21–23 yr. old)and pure stand of Cunninghamia lanceolata in Huitong County of Hunan Province, during 1980–1983. The results are summarized as follows:

1. Concentration of nutrient elements in organs of the C. lanceolata tends toward Ca>Mg>N>K>P. The highest concentrations of nutrient elements were found in the leaf and the lowest in the trunk.

2. Total accumulations of nutrient elements of tree layer, understorey layer and ground-cover layer were estimated to be 1993.83kg/ha, 34.46kg/ha and 166.91kg/ha respectively. Total accumulations of nutrient elements in one ton of standing crop were in the order of tree layer< understorey layer

3. Annual accumulations of nutrient elements in different layers in kg/ha were 112.71 for tree layer, 7.4 for understorey layer and 144.33 for ground-cover layer.

4. Annual mean amount of litterfall in the stand was 1764.35kg/ha, it appeared in two peaks in February and July. Content of nutrient elements in the litterfall was 56.07kg/ha, of which N: was 13.53, P: 3.94, K:3.49, Ca:27.17 and Mg: 7.94kg/ha.

5. Input of annual amount of nutrient elements through precipitation into the stand was 1107 ton/ha, of which N was 18.22; P, ll.10;K, 13.30; Ca, 35.09; and Mg, 43.56kg/ha.

6. Annual uptakes of nutrient elements in the stand in kg/ha was N:41.89, P:15.76, K:19.65, Ca:81.62 and Mg:46.56. The ratios of annual return and annual uptake of nutrient elements were N:0.43, P:0.49, K: 0.29, Ca:0.35, and Mg:0.39.

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