27年生杉木观光木混交林土壤肥力的初步探讨

对27年生杉木观光木混交林及杉木纯林的土壤肥力研究表明,混交林的孔隙状况、水分状况、团聚体结构和养分含量均比纯林有所改善.混交林0～20 cm土壤的非毛管孔隙比纯林的大3.68%,最大持水量、田间持水量和有效含水量分别比纯林高出8.56%、4.92%和8.892%;0～

Primary study on soil fertility in mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum

In this paper, soil fertility in a 27-year-o1d mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum,compared with a pure stand of Cunninghamia lanceolata, were studied. The results showed that soil pore condition,moisturecondition, structure and soil nutrient content had a certain improvement in mixed forest stand. Seeing from the 0~20 cm layer,thenon-capil1ary pore was 3.68% greater than that of pure stand soil; the maximum soil moisture capacity, the fie1d moisture capacityand available soi1 moisture had increased by 8.56%, 4.92% and 8.892%, respectively; the aggregate of >0.25mm in diameter hadincreased by 7.86%, the spoil ratio of aggregate structure was 30.03%, which was l5.69% less than that in pure stand soil; soilnutrient content such as organic matter, N and P increased to a certain degree. Therefore, the mixed forest had stronger function ofimproving site fertility which benefit the maintenance of site fertility under Cunninghamia lanceolata plantation.