黄土高原油松刺槐人工林对土壤肥力影响的研究

THE IMPROVMENT OF THE PINUS TABULAEFORMIS AND ROBINIA PSEUDOACACIA PLANTATION TO THE SOIL FERTILITY ON THE LOESS PLATEAU

研究了黄土高原油松、刺槐人工林对土壤的培肥效应。结果表明：油松、刺槐人工林能显著提高土壤肥力水平，降低土壤ｐＨ。１８龄油松１．２ｍ２及３３龄刺槐１．６ｍ２根区土壤断面的有机质、全氮、有效氮、有效钾、ＣＥＣ均值较无林对照分别提高５７．８％、６８．６％、１０９．３％、２８．９％、５４．４％及７４．３％、１２３．６％、２８５．３％、４２．４％、６３．７％，ｐＨ降低１４．４％及２．９％。油松、刺槐林对土壤的培肥效应符合深度模型ｙ＝Ａ＋Ｂｌｎｈ。

The improvement of the Pinus tabulaeformis and Robinia pseudoacacia plantation to soil fertility on the loess plateau was investigated.The results indicated that:(1)The soil fertility can be enhanced greatly by the plantation.The average values of soil organic matter,total nitrogen,available nitrogen,available potassium,CEC were enhanced by 57.8%,68.6%,109.3%,28.9%,54.4%in the soil profil(1.2m2) of the 18-yearsold Pinus tabulaefrmis,and 74.3%,123.6%,285.3%,42.4%,63.7% in the soil profil(1.6m2) of the 33-years-old Robinia pseudoacacia plantations.while,the soil PH decreased by 14.4% and 2.9% in the Pinus tabulaeformis and Robinia pseudoacacia plantations respectively.(2)The changing tendency of the improvement of the plantations with soil depth can be described by the moddle of y=A+Bln h.