snag tree
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The second, the third and the fourth degree of fallen tree snag, and CWD account for 86 12%, 78 40% and 79 65% wlume of the total volumes of fallen tree, snag and CWD respectively. The water-absorption and water-losing process is the exponential function of the time.
CWD的腐朽级以处于第Ⅱ、Ⅲ和Ⅳ级为主，Ⅱ、Ⅲ、Ⅳ级的倒木、站杆和总的CWD蓄积量分别占倒木、站杆和粗木质残体总蓄积量的 86 12 %，78 4 0 %和 79 6 5 %，CWD的吸湿和脱湿过程是时间的指数函数。
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There are remarkable differences among different succession community of the fallen tree and snag in terms of their volume and decay degree and decay degree of the fallen. The distribution trend generally abides by the rule of increasing with the succession. The decay degree obeys normal distribution.
通过研究表明：长江上游暗针叶林生态系统的CWD总量是101.74 m3/hm2，它的组成体--倒木和站杆在不同演替阶段的容积和腐烂程度是明显不同的，随演替递进，程度加大，分布呈正态分布。
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M 3/hm 2. There are remarkable differences among different succession community of the fallen tree and snag in terms of their volume and decay degree and decay degree of the fallen. The distribution trend generally abides by the rule of increasing with the succession. The decay degree obeys normal distribution.
通过研究表明：长江上游暗针叶林生态系统的CWD总量是 10 1 74m3/hm2 ，它的组成体———倒木和站杆在不同演替阶段的容积和腐烂程度是明显不同的，随演替递进，程度加大，分布呈正态分布。