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由于土壤性质和腐殖质含量的不同,土壤的含水量并不能很好地说明是否适宜植物的生长。本研究以土壤PF(表示土壤的水分状态,与植物的生长发育有密切关系的数值)为主要研究依据,将土壤含水率和PF联系起来,定量研究了贡嘎山地区亚高山暗针叶林不同演替阶段土壤的含水率与PF值之间的相互作用关系。研究结果表明:①在相同的PF时,随着暗针叶林演替的进展,土壤腐殖质层的含水率逐渐增加,即过熟林>成熟林>中龄林>幼龄林。②随着土层深度的增加,土壤容重增加,含水率减小,但各植被演替阶段之间土壤含水率差异并不显著。③植被不同演替系列主要是通过提高其土壤有机质含量,改善土壤结构,降低土壤容重和增加土壤毛管孔隙度等土壤物理特性,改善土壤的蓄水和持水性能。④本区暗针叶林土壤腐殖质层涵养水源作用最为明显。图1表2参15。
Due to the differences in soil properties and humus content, the soil moisture content does not provide a good indication of the suitability of the plant for growth. In this study, PF (soil water status, which is closely related to the growth and development of plants) was taken as the main research basis. The relationship between soil water content and PF was studied. The relationship between soil water content and PF in different successional stages. The results showed that: (1) With the same PF, the moisture content of soil humus layer increased with the progress of dark coniferous forest succession, ie over-mature forest> mature forest> middle-aged forest> young forest. ② With the increase of soil depth, the bulk density of soil increased and the water cut decreased. However, the difference of soil water content between stages of vegetation succession was not significant. (3) The succession series of vegetation mainly improves soil water storage and water holding capacity by improving soil organic matter content, improving soil structure, reducing soil bulk density and increasing soil capillary porosity. ④ The soil humus layer of dark coniferous forest in this area has the most obvious effect on water conservation. Figure 1 Table 2 Reference 15.