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应用分解袋法研究了浙江建德青冈常绿阔叶林凋落物分解过程中的养分动态。结果表明,在2a的分解过程中,各凋落物元素的年均释放率为C27·91%~44·06%,N30·77%~39·58%,P33·33%~42·86%,K42·31%~48·19%,Ca18·67%~36·22%,Mg35·71%~47·22%,Mn25·00%~37·50%,Cu3·80%~16·21%,Zn-17·52%~26·60%。K和Mg流动性较大,Zn、Cu和Ca相对稳定,P、Zn、Cu、Ca、N和Mn在分解过程中有不同程度累积。干物质残留量与N、Ca、Mn、Cu和Zn的残留率呈负相关,与C、K和Mg呈正相关。C、N主要以线性衰减方式释放,P和Mg主要以复合函数方式释放,K主要以对数方式释放,Ca、Mn、Cu和Zn残留率具有3种以上的最优模型。Cu、Zn、Ca和Mn对干物质的分解有促进作用。C∶N比是预示分解速率的最理想指标。枯叶中C∶N比对于N固持和矿化的分界值在20:1左右,C∶P比对于P的净矿化的临界值在600∶1左右。
The nutrient dynamics in litter decomposition process of evergreen broad-leaved evergreen forests in Jiande, Zhejiang Province was studied by using the decomposition bag method. The results showed that the annual average release rates of all the litter elements were C27.91% -44.06%, N30.77% -39.58%, P33.33% -42.86% during the decomposition process of 2a, K42 · 31% -48 · 19%, Ca · 67 · 36% · 36 · 22% · Mg · 71 · 47 · 22% · Mn · 25 · 00% -37 · 50% · Cu 3 · 80% · 16 · 21% Zn-17 · 52% ~ 26 · 60%. The fluidity of K and Mg is relatively large, Zn, Cu and Ca are relatively stable, and P, Zn, Cu, Ca, N and Mn accumulate in different degrees during the decomposition. The residual amount of dry matter was negatively correlated with the residual rate of N, Ca, Mn, Cu and Zn, and positively correlated with C, K and Mg. C and N are mainly released by the linear decay, P and Mg are mainly released by the composite function, K is mainly released by the logarithmic way, and the residual rates of Ca, Mn, Cu and Zn have three or more optimal models. Cu, Zn, Ca and Mn can promote the decomposition of dry matter. C: N ratio is the best indicator of decomposition rate. The cutoff value of C: N ratio in the dead leaves is about 20: 1 for N retention and mineralization, and the critical value of C: P ratio for P mineralization is about 600: 1.