四川林业科技2011，Vol.32Issue(6)：11-18,8.
嘉陵江上游低山暴雨区3种不同植被类型氮循环研究
A Study of Nitrogen Cycle of Different Vegetation Types in Low-mountain and Rainstorm Sections in the Upper Reaches of the Jialing River
摘要
Abstract
Studies were made of nitrogen cycle of different vegetation types in low-mountain and rainstorm sections in the upper reaches of the Jialing River.The nitrogen stocks in the three vegetation types were 6 787.27 kg·hm-2,7 115.39 kg·hm-2 and 6 951.06 kg·hm-2.Among them,the distribution of nitrogen stocks of the living biomass of the three vegetations was as follows：136.43 kg·hm-2,210.40 kg·hm-2,169.66 kg·hm-2;the distribution of nitrogen stock in the litter was as follows：31.06 kg·hm-2,38.96 kg·hm-2 and 40.05 kg·hm-2;the distribution of nitrogen stock in the soil as was follows：6 619.73 kg·hm-2,6 866.03 kg·hm-2 and 6 741.35 kg·hm-2.It was found that most of the nitrogen in the three vegetations was stored in the soil,but not in the living biomass.The nitrogen contents in stemflow in the three vegetations were 0.44 kg·hm-2,0.553 kg·hm-2 and 0.851 kg·hm-2.The nitrogen contents in throughfall were 12.649 kg·hm-2、12.551 kg·hm-2 and 13.291 kg·hm-2.The nitrogen input in stream flow was 0.55 kg·hm-2,0.55 kg·hm-2 and 1.27 kg·hm-2.The nitrogen biologic cycling of the three vegetations was：37.561 kg·hm-2·a-1 taken up by plants,6.497 kg·hm-2·a-1stored in living biomass,and 31.064 kg·hm-2·a-1 returned to soil in Pinus elliottill.48.976 kg·hm-2·a-1 were taken up by plants、10.019 kg·hm-2·a-1 were stored in living biomass,38.957 kg·hm-2·a-1 were retuned to soil in Robinia pseudoacacia.48.127 kg·hm-2·a-1 were taken up by plants,8.079 kg·hm-2·a-1 were stored in living biomass,40.048 kg·hm-2·a-1 were retuned to soil in mixed forest.Nitrogen absorption amount and stored amount were Robinia pseudoacacia forestmixed forestPinus elliottill forest.And the nitrogen return amount was mixed forestRobinia pseudoacacia forestPinus elliottill forest.Studies showed that the three vegetation types had the nitrogen conservation mechanism and remained in the nitrogen accumulation state.关键词
不同植被类型/氮循环/氮归还/氮输出Key words
different vegetation types/nitrogen cycle/return amount of nitrogen/nitrogen output amount分类
农业科技引用本文复制引用
吴雪仙,龚固堂,张发会,陈俊华,朱志芳,慕长龙,张启珍..嘉陵江上游低山暴雨区3种不同植被类型氮循环研究[J].四川林业科技,2011,32(6):11-18,8.基金项目
“川中丘陵区人工柏木林健康经营技术” （）
