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密度对缺苞箭竹凋落物养分归还及养分利用效率的影响

期刊名称：应用生态学报,2007, 18(9):20025-20029
时间：0
分类：S718.5[农业科学—林学]
作者机构：[1]内江师范学院化学与生命科学系,四川内江 641112, [2]华东师范大学上海市城市化过程和生态恢复重点实验室,上海 200062
相关基金：国家自然科学基金重大项目（90511008）、中-芬国际合作项目（30211130504）、四川省科技厅应用基础项目（05JY029-016）和四川省教育厅重点资助项目（05A166）.致谢感谢陈佑平、蒋仕伟、赵联军、黄俊忠、刘斌和严罗贵等的大力支持和帮助.
相关项目：青藏高原东缘高山树线区复合群落地段碳库动态与气候变暖

关键词：缺苞箭竹, 凋落物, 养分归还, 养分利用效率, Fargesia denudate, litterfall, nutrient return, nutrient use efficiency.

中文摘要：

在缺苞箭竹-紫果云杉原始林下,选取3个密度（D1、D2、D3）的缺苞箭竹,研究了密度对缺苞箭竹凋落物量、养分归还量及养分利用效率的影响.结果表明：3个密度缺苞箭竹的年凋落物量分别为793.2、1 135.7和1 458.5 kg· hm^-2,C归还量分别为370.7、516.2和671.5 kg·hm^-2,5种主要养分归还量分别为16.3、22.9和29.3 kg·hm^-2,均随密度的增大而增加.各密度养分年归还量中均以Ca最高（占总量的48%～58%）,P和Mg最低（3%～5%）,总体排序为Ca＞N＞K＞Mg、P.除高密度（D3）缺苞箭竹在8月有一个凋落与养分归还小峰外,10月生长季末是各密度缺苞箭竹凋落及养分归还高峰期.不同密度缺苞箭竹叶N和K的再分配能力无显著差异,P的再分配能力随密度的增大而增强,Ca、Mg则显著积累.缺苞箭竹P的养分利用效率随密度的增大而增高,表明P可能是缺苞箭竹生长更新的限制因子.

英文摘要：

A two-year study on the effects of three densities （D1 80 ± 5 stems·m^-2 , D2, 140±8 stems·m^-2 ; and D3 , 220 ± 11 stems · m ^-2） of Fargesia denudate in a F. denudata - Picea purpurea natural forest on the F. denudate litterfall production, nutrient return, and nutrient use efficiency showed that at the densities of D1, D2 and D3, the annual litterfall production was 793.2,1 135.7 and 1 458.5 kg ·hm^-2, carbon return was 370. 7 , 516. 2 and 671.5 kg ·hm^-2 , and the total return of N, P, K, Ca and Mg was 16. 3,22.9 and 29. 3 kg ·hm^-2, respectively. Ca had the highest return （45%-48% of the total）, followed by N （24%-29%）, and the lowest were P and Mg （3%-5%） , with the sequence of Ca 〉 N 〉 K 〉 Mg and P. The peaks of litterfall production and nutrients return at the three densities were appeared in October （by the end of F. denudate growth season） , and another peak at D3 was observed in August. There were no significant differences in the re-allocation of N and K in F. denudate leaves at the three densities, but the P re-allocation and the Ca and Mg accumulation increased with increasing density. The litterfall P use efficiency was the highest and increased with increasing density, implying that P could be a limiting factor for the growth and regeneration of F. denudate.

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