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运用以空间代替时间,以糙野青茅草地、柳树灌丛、白桦林、混交林、冷杉林为植物自然恢复的序列,采用环刀法和实地调查-水浸法研究了川西亚高山植被恢复过程中土壤和地被物的持水能力。结果表明:土壤容重随深度增加而加大、随植被恢复而降低;土壤持水能力随深度增加而降低、随植被恢复而增加,表现为混交林>冷杉林>柳树灌丛>白桦林>草地;地被物储量及其持水能力随植被恢复极显著增加,其组成由草地的凋落物为主到冷杉林时以苔藓为主;生态系统土壤和地被物的持水能力随着恢复而显著提高,表现为混交林>冷杉林>柳树灌丛>白桦林>草地。因此,亚高山植被自然恢复能显著增加区域生态系统的土壤和地被物持水,适度增加阔叶树亦有利于促进川西亚高山恢复植被的土壤持水。
By using space instead of time, the method of ring knife and field survey were used to study the natural recovery of plants by the steppe grass, the willow shrub, the birch forest, the mixed forest and the fir forest. Soil and groundwater holding capacity during the process. The results showed that the bulk density of soil increased with depth and decreased with the restoration of vegetation. Soil water capacity decreased with depth, and increased with the restoration of vegetation, which showed that the soil bulk density varied from mixed forest> fir forest> willow shrub> birch forest> grassland ; The amount of groundwater reserves and its water holding capacity increased significantly with the vegetation restoration, and its composition was dominated by moss in the litter of the grassland mainly to the fir forest; the water holding capacity of the ecosystem soils and ground cover increased with the recovery Significantly improved, the performance of the mixed forest> Abies> willow shrub> Betula platyphylla> grassland. Therefore, the natural restoration of subalpine vegetation can significantly increase the water holding capacity of the soil and ground cover of regional ecosystems. Appropriate increase of broad-leaved trees is also conducive to soil water conservation of sub-alpine vegetation in western Sichuan.