农牧交错带不同人工植被下荒漠化土壤肥力的变化

Desertified Soil Fertility under Different Artificial Vegetations in Farming-Pasturing Interlock Zone of Northern Shaanxi Province

研究了陕北农牧交错带荒漠化土地上种植人工植被后,在不同的植被恢复类型和生长状态下土壤物理、化学和生物学性状的特征。结果表明,随着人工植被的建立与生长,土壤肥力总体趋于好转,土壤理化性质得到显著改善,土壤质地变细,微生物数量增加,土壤酶活性增强;同时,使流动沙地向半固定、固定沙丘方向转化。但随着植被盖度和植被种类的不同,不同样地土壤肥力差异很大;多年生乔木林改良土壤肥力的潜力最高,耕作粗放的农地土壤肥力有所下降。

The soil physical, chemical and biological properties are different in various planted vegetations and their growth state on desertified land of the farming-pasturing interlock zone in northern Shaanxi province. In the growing processes of established vegetations, soil fertility turns to better, the physical and chemical properties get remarkable improvement, soil texture becomes finer, microorganisms increase and enzyme activities are enhanced; at the same time, the mobile sand dunes become to be semi-fixed and fixed sand dunes. Under different vegetation types with different coverage, soil fertility are remarkably different, the potential of perennial arbor forest improving soil fertility is the highest, whereas, the soil fertility of farmlands with inferior management has decreased.