Li Qian, Liu Zeng-Wen, Du Liang-Zhen
College of Forestry. Northwest A & F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2012 Mar;23(3):595-602.
In this study, the leaf litters of Populus simonii and other 11 tree species were put into soil separately or in mixture after grinding, and incubated in laboratory to analyze the effects of their decomposition on soil properties and the interactions between the litters decomposition. The decomposition of each kind of the leaf litters in soil increased the soil urease, dehydrogenase, and phosphatase activities and the soil organic matter and available N contents markedly, but had greater differences in the effects on the soil available P content and CEC. The decomposition of the leaf litters of Caragana microphylla and of Amorpha fruticosa showed obvious effects in improving soil properties. The decomposition of the mixed leaf litters of P. simonii and Pinus tabulaeformis, Platycladus orientalis, Robinia pseudoacacia, or Ulmus pumila showed interactive promotion effects on the abundance of soil microbes, and that of the mixed leaf litters of P. simonii and P. orientalis or C. microphylla showed interactive promotion effects on the soil organic matter, available P, and available K contents and soil CEC but interactive inhibition effects on the activities of most of the soil enzymes tested. The decomposition of the mixed leaf litters of P. simonii and Larix principis-rupprechtii showed interactive promotion effects on the activities of most of the soil enzymes and soil nutrient contents, while that of the mixed leaf litters of P. simonii and P. sylvestris var. mongolica showed interactive inhibition effects. Overall, the decomposition of the mixed leaf litters of P. simo- nii and U. pumila, P. tabulaeformis, L. principis-rupprechtii, or R. pseudoacacia could improve soil quality, but the mixed leaf litters of P. simonii and P. orientalis, C. microphylla, P. sylvestris var. mongolica, Hippophae rhamnoides, or A. fruticosa showed an interactive inhibition effect during their decomposition.
在本研究中，小叶杨及其他11种树种的落叶经研磨后单独或混合放入土壤中，并在实验室中进行培养，以分析它们的分解对土壤性质的影响以及落叶分解之间的相互作用。土壤中各类落叶的分解显著提高了土壤脲酶、脱氢酶和磷酸酶活性以及土壤有机质和有效氮含量，但对土壤有效磷含量和阳离子交换量的影响差异较大。小叶锦鸡儿和紫穗槐落叶的分解对改善土壤性质有明显作用。小叶杨与油松、侧柏、刺槐或白榆混合落叶的分解对土壤微生物丰度有交互促进作用，小叶杨与侧柏或小叶锦鸡儿混合落叶的分解对土壤有机质、有效磷和有效钾含量及土壤阳离子交换量有交互促进作用，但对所测试的大多数土壤酶活性有交互抑制作用。小叶杨与华北落叶松混合落叶的分解对大多数土壤酶活性和土壤养分含量有交互促进作用，而小叶杨与樟子松混合落叶的分解则有交互抑制作用。总体而言，小叶杨与白榆、油松、华北落叶松或刺槐混合落叶的分解可改善土壤质量，但小叶杨与侧柏、小叶锦鸡儿、樟子松、沙棘或紫穗槐混合落叶在分解过程中表现出交互抑制作用。
