长江上游华山松水土保持人工群落的结构特征与生物量

通过定位监测与样地调查，分析了长江上游华山松水土保持人工群落的结构特征，并对其生物产量进行了测定。结果表明：由于人工林分造林密度大，以及人为干扰的作用，影响到林下灌木、草本层的生长和发育，凋落物层也被严重破坏，群落结构简单，表现为乔木层和草本层的二层结构特征。因此，合理的林分密度和对凋落物层的保护是水土保持人工群落组建与经营管理的二个重要方面。流域16年生华山松人工群落总生物量为45．39t/hm^2，其中乔木层生物量为42.84t/hm^2，占群落总生物量的95.40%，灌木、草本和凋落物层的生物量分别与占群落总生物量的0．60％、1．80％和2．20％。

The Structural Feature and Biomass of Soil and Water Conservative Plantation of Armand Pine in the Upper Reach of the Yangtze River

Based on the locating monitoring and sample plot investigation, this paper discussed the structural feature and biomass of soil and water conservative plantation of Armand pine in the upper reach of the Yangtze river. The result shows that the structure of the plantation is simple and characterized by two -layer structure, i. e. tree and grass layer, due to the high stands density and human disturbance, which results in the undergrowth of this plantation is undeveloped and the litter lay-er is severely destroyed. Therefore, it is important to the construction and management of soil and water conservative plan-tation to take a reasonable stands density and protect the litter layer. The total biomass of the 16 year Armand pine planta-tion is 45. 39 t/hm2, among which the tree layer biomass is 42. 84 t/hm2, accounting for 95. 40% of the community total biomass while the shrub, grass and litter layer occupying of 0.60% , 1.80% and 2.20% respectively.