岷江上游不同植被恢复模式枯落物层水源涵养能力

为了阐明不同植被恢复模式水源涵养功能，采用野外调查与室内分析相结合的方法，以岷江上游山地森林-干旱河谷交错带为研究对象，开展不同植被恢复模式枯落物层现存量、持水过程、吸水过程等方面研究。结果表明：不同植被恢复模式中，枯落物现存量大小依次是天然次生林>刺槐林>岷江柏-油松幼林>岷江柏幼林>沙棘+金花小檗灌丛>荒草地。不同植被恢复模式枯落物半分解层占现存总量比例均在60%以上，且均大于未分解层占现存总量比例，其中岷江柏幼林最高（79.89%），天然次生林最低（60.66%）。刺槐林和天然次生林模式枯落物最大持水量较大，分别为53.25和53.22 t·hm-2，岷江柏-油松幼林模式次之，荒草地最小。不同植被恢复模式枯落物半分解层持水量均大于未分解层，且持水量与浸水时间间呈对数、幂函数、线性和指数函数等关系；而枯落物未分解层、半分解层的吸水速率与浸泡时间均呈幂函数关系。研究成果可为区域合理选择植被恢复模式提供科学参考。

Water Conservation Capacity of Litters in Different Vegetation Restoration Patterns in the Upper Reaches of Minjiang River

In order to clarify the water conservation functions of different vegetation restoration patterns. Based on the methods of field survey and indoor analysis， taking mountain forest-arid valley intersection zone in the upper Minjiang River as the research object, the existing litter layer, water holding process and water absorption process were carried out under different vegetation restoration patterns. Under different vegetation restoration patterns, the litter stock of the litter showed an order of NSF>LF>MP>M >S> G. Under different vegetation restoration patterns, the proportion of semidercomposed litter layer in the existing total was higher than that of undecomposed litter layer, which were more than 60%. The proportion of semidercomposed litter layer was the highest for the pattern of M(79.89%), and the pattern of NSF was the lowest(60.66%). The maximum water holding capacity of litter was 53.25 t·hm-2 and 53.22 t·hm-2, respectively for the pattern of LF and NSF, followed by that of MP pattern, and the maximum water holding capacity of litter in G pattern was the least. Under different vegetation restoration patterns, the water holding capacity of the semi-decomposed litter layer was higher than that of the undecomposed litter layer, and the relationship between water holding capacity and time of soaking showed mutiple correlation such as logarithmic, power function, linear and exponential function. The relationship between water absorption rate and time of soaking for the undecomposed layer and semi-decomposed layer of litters showed the power functions under different vegetation restoration patterns. The results can provide scientific foundation for the rational selection of vegetation restoration patterns in the region.