毛乌素沙地土壤水分对中国沙棘人工林稳定性及生产力的影响

Influence of Soil Physico-chemical Properties in Maowusu Sandland on the Stability and Productivity of Hippophae rhamnoides subsp. sinensis Plantation

为了解土壤水分对中国沙棘稳定性及生产力的影响,对毛乌素沙地平地与洼地人工林的相应特征进行比较分析,以期为毛乌素沙地造林设计与立地选择提供参考依据。结果表明:洼地土壤的含水率、全P及全K含量均显著高于平地,但土壤含水率对种群特征的形成起着主导作用;洼地的树高生长量、林分生产力、子株数量显著高于平地,且其种群年龄结构属于增长型(或稳定型),而平地的属于衰退型。由此可见:林分生产力和种群稳定性具有良好的一致性,土壤含水率高则洼地林分生产力高、种群稳定性强,土壤含水率低则林分生产力低、种群稳定性弱。

In order to know the impact of soil moisture oncared in flatland and low-lying land in Maowusu sandlandthe stability and productivity, the plantations lo-were selected to do comparative analysis on cor-responding characteristics with a view to providing reference for the Maowusu Sandland afforestation de-sign and site selection. The results show that the soil moisture content, total phosphorus and total kaliumcontent of low-lying land were all significantly higher than flatland, but the soil moisture content played adominant role in the formation of the characteristics of the plantation;the tree height growth ,forestry pro-ductivity and ramet number of low-lying land were significantly higher than flatland, and its plantation agestructure belongs to a growing （or stable ） one, but the flatland belongs to declining type. Thus, forestryproductivity and plantation stability have good consistency, as the soil moisture contentis higher, the forest-ry productivity and plantation stability of low-lying land become better, as the soil moisture content is low-er, the forestry productivity and plantation stability of flatland become worse.