樟子松与其他10种凋落叶混合分解的养分释放特征  

Nutrient Release Characteristics during Decay of Mixed Leaf Litter of Pinus sylvestris var. mongolica with Other 10 Tree Species

作　　者：张晓曦[1] 刘增文[2,3] 邴塬皓 朱博超[2] 杜良贞[4] 祝振华[2] 

机构地区：[1]西北农林科技大学水土保持研究所,杨凌712100 [2]西北农林科技大学资源环境学院,杨凌712100 [3]农业部西北植物营养与农业环境重点实验室,杨凌712100 [4]西北农林科技大学林学院,杨凌712100

出　　处：《林业科学》2014年第7期149-156,共8页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(31070630);西北农林科技大学大学生创新实验计划项目(2010年)

摘　　要：樟子松（Pinus sylvestris var.mongolica）是黄土高原北部半干旱风沙区重要的造林树种,具有良好的改善生态环境、保持水土性能。然而,与其他很多纯林一样,樟子松纯林的生长后期也逐渐出现了地力衰退、土壤退化和下木更新困难等问题（曾德慧等,2002;刘增文等,2009）。Establishment of mixed forests is an essential way to improve the stability of forest ecosystem. In order to select appropriate tree species for mixing with Pinus sylvestris var. mongolica, leaf litters from P. sylvestris var. mongolica and other 10 tree species were collected. The litter samples were cleaned, air-dried, and then cut and mixed with 1：1 ratios. The mixed litters were placed in nylon litterbags and incubated in the potting soil for a 345-day decay period under constant temperature and moisture in lab. The weight and concentrations of 8 nutrient elements in the litters before and after the decay were determined. The results showed： the leaf litter of P. sylvestris var. mongolica had the poorest substrate quality with the highest C concentration and C/N ratio, but the lowest N concentration; The mixed leaf litter decay had greater impacts on microelement release than on macro-elements; Mixture of leaf litters from Platycladus orientalis, Larix principis-rupprechtii, Ulmus pumila or Hippophae rhamnoides with that from P. sylvestris var. mongolica accelerated the release of C, N, P, Cu, Zn, Fe and Mn; Mixture of leaf litters from Populus simonii with that from P. sylvestris var. mongolica accelerated the release of N, P, Cu, Zn, Fe and Mn; Mixture of leaf litters from Caragana microphylla with that from P. sylvestris var. mongolica accelerated the release of C, N, P, Cu and Fe, and mixture of leaf litters from Amorpha fruticosa with that from P. sylvestris var. mongolica accelerated the release of N, P, Cu and Zn. According to a comprehensive analysis, mixed litters of P. sylvestris var. mongolica respectively with L. principis- rupprechtii, 11. rhamnoides, P. orientalis and U. pumila showed positive impacts on decay and nutrient release, but negative influences when mixed with R. pseudoacacia, B. platyphylla and Q. liaotungensis.

关 键 词：樟子松 凋落叶混合分解 养分释放 

分 类 号：S714.2[农业科学—林学]