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以黄土高原区典型植物刺槐、小叶杨、沙棘、沙柳、苜蓿和长芒草的凋落物为对象,采用网袋法研究了半干旱区(神木)分解过程中,单种、两种及3种凋落物等质量配比混合后其质量、碳和氮的动态变化.结果表明:在整个分解过程中,不同处理凋落物的质量损失率,全碳、全氮的释放速率以及可溶性有机碳和可溶性总氮的含量均表现为前期大于后期.经过412d的分解,3种凋落物混合后的平均质量损失率高于两种混合凋落物,单种凋落物最低.到分解试验结束时,不同处理凋落物的全碳、全氮平均释放率均表现为单种>两种混合>3种混合;而不同处理的可溶性有机碳平均含量表现为两种混合>单种>3种混合,但未达到显著水平;可溶性总氮含量则为3种混合>两种混合>单种,达到显著水平.凋落物的质量损失率与可溶性有机物,特别是可溶性有机碳具有一定的相关性.从质量损失率来看,小叶杨、沙棘与苜蓿凋落物的组合为最佳组合.建议在黄土高原区退耕还林还草工程建设中,合理增加植物种类多样性,促进土壤改善养分状况.
The litter of Robinia pseudoacacia, Populus simonii, Seabuckthorn, Salix psammophila and Medicago sativa L., a typical plant species in the Loess Plateau, were used to study the effects of single, double and triple Litter, etc. The results showed that during the whole decomposition process, the mass loss rate of litter, the release rate of total carbon and total nitrogen as well as the content of soluble organic carbon and soluble After 412 days of decomposition, the average mass loss rate of the three kinds of litter mixed was higher than that of the two kinds of mixed litter, and the lowest of the single litter.The litter of different treatments was the end of the decomposition test The average total carbon and total nitrogen release rates of the two species showed single species> two species> three species, while the average content of dissolved organic carbon in different treatments showed two kinds of mixture> single species> three species but did not reach significant (P <0.05). The total soluble nitrogen content of three kinds of mixed> two kinds of mixed> single species reached a significant level.Low mass loss rate of litter and soluble organic matter, especially soluble organic carbon has some relevance.From the mass loss rate Look, lobular Yang, a combination of sea buckthorn and alfalfa litter was the best combination is recommended in the district returning farmland to forest and grassland in the Loess Plateau Project, a reasonable increase in plant species diversity, the promotion of improved soil nutrient status.