树木枯落叶在河流水体中的分解及氮、磷释放动态  

Trends of Defoliation Decomposition and Nitrogen and Phosphorus Release in River Water

作　　者：赵勇[1] 苗蕾[1] 孙聪楠[1] 樊巍 孙中党 

机构地区：[1]河南农业大学,河南郑州450002 [2]河南省林科院,河南郑州450003 [3]郑州市环境保护科学研究所,河南郑州450007

出　　处：《水土保持学报》2010年第1期172-175,共4页Journal of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划(2006BAD03A17);河南省科技攻关项目(0624090010)

摘　　要：以郑州市东风渠为试验点,选择法国梧桐枯落叶为对象,利用分解袋法,在为期39d的分解试验中,研究了落叶分解及氮、磷的动态变化。结果表明:分解过程中,样品质量变化呈现持续减少的趋势,试验期间质量损失约11.6%,理论完全分解时间约8.21a。在生物和非生物因素共同作用下,落叶中的氮、磷含量变化波动较大。试验初期(0-9d),氮含量快速降低;然后又表现为逐渐升高,在分解后期(29-39d)又呈现下降趋势。落叶中磷含量在分解初期呈下降趋势,随后又逐渐升高,到分解中期,磷含量又表现为先下降后升高的趋势,至分解末期,再次出现下降。落叶中氮素的累积指数NAI和磷素累积指数PAI整体上表现出以释放为主。随分解时间,大体上呈现释放-积累-再释放的规律。To provide information for understanding nutrient cycling and energy flow in fluvial ecosystems,this paper studied the litter decomposition and elements release dynamics in river water of Dongfeng River in Zhengzhou city,Henan province,using string mesh bag technique. The trail was taken on for 39 days. The results showed that the litter mass had a continuous decreasing pattern and lost 11.6% of the total mass in decomposing process. The trend of dry mass 1oss followed the negative exponential equation. The decomposed time of 95% litter were 8.21 years. The biological and non-biological factors had significant influence on the nitrogen and phosphorus release of the litter. In the first 9 days,nitrogen in the litter lost rapidly,then gradually rise a little,and then,in the last 10 days,lost rapidly again. Meanwhile,the phosphorus in litter showed a fluctuating losing trend during decomposition period：decreased and then increased at the first and medium stage,and decreased again at the late stage. According to the nitrogen accumulation index （NAI） and phosphorus accumulation index （PAI）,the nitrogen and phosphorus in litter was mainly released,and had an alternant change characteristics of release-accumulation-release course.

关 键 词：枯落物分解 元素释放 分解袋法 水体污染 

分 类 号：X171.1[环境科学与工程—环境科学]