Evaluation of the Effect of Thinning and Replanting on Succession Process of Betula spp. Natural Secondary Forests in Subalpine Regions of Western Sichuan
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摘要: 本研究以不同强度疏伐、不同密度补植云杉的桦木天然次生林为研究对象，通过典型抽样法、收获法和模型模拟法等方法获取和分析了不同处理措施下补植苗木成活情况，桦木林林分的生物量，灌、草生物多样性和林地水源涵养能力等指标，研究不同处理措施对川西亚高山桦木天然次生林正向演替进程的影响，并利用隶属函数的方法开展评价。结果表明，与对照措施相比，疏伐和云杉补植措施均在不同程度上改善了林下更新和灌草的生物多样性，也对以乔木为主的林分生物量产生了促进作用，但对林地水源涵养功能的改变不显著。而从1年的短期效应看，S2+B3措施，即按照蓄积量伐除林分20%桦木，且在林下按照2 000株·hm-2的密度进行云杉苗木补植的处理措施对桦木次生林群落的演替进程促进效果最佳。Abstract: Survival rate of replanting, total biomass, diversity of shrub and grass layers and water conservation ability of ground cover and soil from different modes (7 modes in all, they are respectively S1+B1, meaning to do nothing; S2+B1, meaning cutting down 20% birch according to stock; S2+B2, cutting 20% birch according to stock and replanting spruce seedlings according to 2 500 trees per hectare;S2+B3, cutting down 20% birch according to stock and replanting spruce seedlings according to 2 000 trees per hectare;S3+B1, meaning cutting down 40% birch according to stock;S3+B2, means cutting down 40% birch according to stock replanting spruce seedlings according to 2 500 trees per hectare;S3+B3, cutting down 40% birch according to stock and replanting spruce seedlings according to 2 000 trees per hectare) have been measured and sampled, and Effects of thinning and replanting on Succession process have been analyzed from Betula spp. natural secondary forests through representative sampling, harvesting and modeling, evaluated by subordinate function method. The result showed that seedlings, diversity of shrub and grass under forest and the stand biomass that mainly came from tree biomass increased at different level, but not for water conservation ability of ground cover and soil after thinning and replanting 1 years later. S2+B3 mode was the best one for effecting on succession process of Betula spp. natural secondary forests in all of 7 modes.
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Key words:
- Subalpine regions of western Sichuan;
- China;
- Thinning;
- Replanting;
- Succession
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