杉木-山苍子-作物复合经营模式土壤肥力的研究

STUDIES ON THE SOIL FERTILITY IN THE AGROFORESTRY PATTERN OF CHINESE FIR WITH LITSEA CUBEBA AND CROPS

通过对杉木-山苍子(A)、杉木-山苍子-黄豆(B)、杉木-山苍子-烟叶(C)及对照的纯杉林土壤生物学活性、土壤化学性质、土壤结构、孔隙组成和水分性状等研究,结果表明:模式B、C表层土壤结构性状变差,土壤营养元素含量下降,土壤生物学活性减弱,但底层土壤熟化程度提高。为了维持幼林地土壤肥力,模式B、C应适当降低耕作强度,缩短间种年限,同时适当增加N和P肥使用量。模式A具有良好的改良土壤能力,是南方林区优良的杉木混农模式。

Studies on soil biological activities, chemical properties and structures ofsoil, constituents of pores and water status have been carried out in differentAgroforastry patterns, including Chinese fir-litsea cubeba (A), Chinese fir-litsea cubeba-Soybean (B), Chinese fir-litsea cubeba-Tobacco (C) and pureChinese fir forest. The results indicuted that the resultes showed that the top-soil structures of pattern B and C became poor, the content of soil nutrientsdeclined, soil biological activities decreased, but the ripening level of subsoilraised. In order to mantain the soil fertility of cultivated land, Pattern B andC would reduce the strength of cultivation, shoten the period of interplantingtimes, and appropriately increase the amount of the fertiliers of N and P Pa-ttern A had a good ability to modifing soil. Thus it would be a good agro-forestry pattern for Chinese fir in south forest areas of China.