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简介:采用分级测定的方法对梁子湖沉积物中无机磷酸盐进行了分析,测定了梁子湖水体P的季节变化,并以室内模拟的方法研究梁子湖沉积物在pH值和温度控制下P的释放特征.研究表明,梁子湖水体P的含量呈明显的季节变化,冬季高,夏季低.沉积物无机磷(Pi)中以钙磷(Ca-P)为主(55%~61%),铁磷(Fe-P)次之(28%~33%),铝磷(Al-P)最少(3%~5%).在梁子湖的入水口和出水口,由于沉积环境影响到P的形态,P的释放明显较湖心高.在试验初期,由于扰动的影响,使得P的释放在第1天比第2天和第3天高,其后P的释放量则迅速增加.温度对P释放影响明显,其具体表现为,30℃时P释放达到峰值的时间比4℃时提前4d,而且前者峰值比后者高出9倍.pH值对沉积物P释放同样有明显的影响,与正常状态下的湖水条件(pH值为8.5)相比,偏酸(pH值为5.5)和偏碱(pH值为11.5)条件下,P的释放量增加.
简介:认为有必要在基于碳汇的土地利用和当地可持续发展之间建立一种更加明确的联系.依托一个中国-加拿大合作项目,以中国贵州省黎平县为例,阐述了一种将森林碳汇、森林资源管理以及如何促进当地可持续发展联系起来的综合评估方法,并且着重介绍了能帮助资源管理和规划部门实施这种综合评估的土地利用决策支持工具(LUDST).