川西林区森林采伐迹地土壤肥力的初步研究

川西林区是目前正在扩大采伐利用和经营活动的林业基地,采伐迹地面积较大,因此,探索采伐迹地土壤肥力的演变,对迅速恢复森林复被,保持生态环境平衡,有一定的理论和实践意义。本文是川西林区不同采伐迹地类型土壤条件与森林更新关系定位试验研究的一部分,主要是探讨森林采伐后土壤肥力的变化规律,为制定合理的森林经营措施提供依据。

A PRELIMINARY STUDY ON SOIL FERTILITY OF THE CUT-OVER AREA IN WESTERN SICHUAN

This paper deals with the study by plot experiments, on the relationship between soil conditions of different cut-over areas and reforestation. The results showed that the hydrothermal regime of the cut-over area where trees were removed sia years ago could possibly meet the needs of growth of regenerated seedlings. Owing to the significant variation of the hydrothermal regime of the surfac soil (0-20 cm) of cut over area nn the sunny slope at high altitude, it was necessary bo take proper sheding measures for the favorable growth of seedlings. The larger amount of carbon dioxide that was evolved from the soil surface and contained in the soil of the cut-over area as compared with that of the forest land showed that the biological activities were intensified, the decomposition of organic matter was accelerated and the contents of nitrogenous nutrients were increased. All these were conducive to the improvement of soil fertility and thereby benefical to the growth of young trees and reforestation of the cut-over area.