关帝山天然次生林枯落物蓄积量及持水特性研究

发布时间：2018-07-01 19:53

本文选题：天然次生林 + 枯落物　；参考：《山西农业大学》2015年硕士论文

【摘要】：以关帝山林区5种典型林分类型为研究对象,通过野外设置标准地,分层采集样方和室内称重、浸泡对其林下枯落物的组成和蓄积量及其持水性能进行了测定。结果表明：(1)5种典型林分林下枯落物的蓄积量之间存在显著差异,范围从31.07-69.95t/hm2,大小排序为：油松林华北落叶松林白桦林辽东栎林云杉林；(2)同一林分或不同林分中未分解层的枝、叶、果和其他枯落物储量均存在显著差异,5种林分的枯落物半分解层储量表现出阔叶林大于针叶林；(3)5种林分类型枯落物的最大持水量变动范围在59.47-149.18 t/hm2,按其大小排序为：油松林白桦林华北落叶松林辽东栎林云杉林；最大持水率变动范围在166.62-320.28%,按其大小排序为：白桦林辽东栎林油松林云-杉林华北落叶松林；有效拦蓄深的变化范围在2.05-5.48mm,按其大小排序为：油松林白桦林华北落叶松林辽东栎林云杉林；(4)5种林分枯落物及各组成部分的持水量和持水率总变化趋势是随时间的延长而增加,其在lh内的增量最大,以后逐渐减小直至饱和时为零。通过回归得出其持水量、持水率与浸水时间之间存在对数关系R t=a 1n(t)+b；(5)5种林分枯落物及各组成部分的吸水速率均随时间的延长而减小,通过回归得出其吸水速率与时间呈现幂函数关系V=ktn；(6)不同组成部分持水对总枯落物持水能力产生不同影响,其中半分解层对总枯落物持水所做的贡献最大,贡献率可达50%左右,在未分解层中贡献率最大的是叶枯落物,而果的贡献率最小。这些研究结果可为今后关帝山林区森林经营管理、健康检测评价及生态环境建设和植被的恢复、保护提供理论依据。
[Abstract]:Five typical stand types in Guandi Mountain Forest District were studied. The composition, storage capacity and water holding capacity of litter in Guandi Mountain forest area were measured by means of stratified sampling and indoor weighing by setting standard plots in the field. The results showed that: (1) there was significant difference in litter accumulation between five typical stands, ranging from 31.07-69.95 t / hm ~ (2), in order of order: Pinus tabulaeformis, North China larch forest, birch forest, Liaodong oak forest, Picea lanceolata forest, (2) branches of undecomposed layer in the same stand or different stand, There were significant differences in the reserves of leaf, fruit and other litter. The reserves of litter semi-decomposed layer of five stands showed that the reserves of broad-leaved forest were larger than that of coniferous forest. (3) the maximum water holding capacity of litter in five forest types ranged from 59.47-149.18 t / hm ~ (2), in order of order: Pinus tabulaeformis white birch forest, North China larch forest, Liaodong oak forest, Picea lanceolata forest; The maximum water holding rate ranged from 166.62-320.28.The order was as follows: Pinus tabulaeformis forest in birch forest, Pinus tabulaeformis forest in Pinus tabulaeformis forest and larch forest in Chinese fir forest; The change range of effective storage depth is 2.05-5.48mm, according to its size, the order is: Pinus tabulaeformis forest, North China larch forest, Liaodong oak forest, Picea lanceolata forest; (4) the total change trend of litter and water holding capacity and water holdup of five kinds of forest is increasing with time. The increment in lh is the largest and then decreases gradually until the saturation is zero. The logarithmic relationship between water holdup and soaking time was obtained by regression, and the water absorption rates of litter and components of 5 stands decreased with the time prolonging, and there was a logarithmic relationship between water holdup and soaking time. By regression, the relationship between water absorption rate and time was found to be a power function, (6) the water retention of different components had different effects on the water holding capacity of total litter, and the semi-decomposition layer had the greatest contribution to the water holding capacity of total litter. The contribution rate can reach about 50%, the largest contribution in the undecomposed layer is leaf litter, while the contribution of fruit is the least. These results can provide theoretical basis for forest management, health assessment, ecological environment construction, vegetation restoration and protection in Guandi Mountain Forest District in the future.
【学位授予单位】：山西农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S714

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