严重侵蚀红壤重建森林的土壤生态效益研究

A Study on Ecological Benefit of Reforestation Soil in Seriously Degraded Red Soil Regions

江西弋阳县龟峰镇属严重退化红壤区域.1999年采取湿地松与胡枝子混交模式重建森林,2002年对林龄12年的林地生态功能指标的调查研究表明:(1)林地0～40 cm土层内有机质和全氮量普遍高于对照区各层,分别高87.95%和36%,全磷和有效磷分别增加40.9%和22.3%,但有效钾下降了8.13%.(2)林地土壤通气状况、持水状况和渗透状况得到明显改善.(3)0～40 cm土层内的蛋白酶、过氧化氢酶、脲酶活性普遍高于对照区,而且随土层下降而明显减弱.

Guifeng Town, Yiyang County is in a seriously degraded red soil region. The mixed forest of Pinus elliottii and Lespedaza spp. was adopted for reforestation in 1991. The results of the investigation on the function of the soil-system on the 12 years old forest showed that: 1)Organic matter and total nitrogen of the forest soil in the depth of 0~40 cm were 87.95 per cent and 36 per cent higher than those of CK, total phosphorus and available phosphorus were 40.9 per cent and 22.3 per cent higher than those of CK; available potassium were 8.13 per cent lower than that of CK; 2) Soil aeration and soil air regime of the forest were improved ;3) Proteinase, catalase,urease of the forest soil in the depth of 0~40 cm were commonly higher than those of CK, and decreased with the depth of soil.