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| 不同草地利用方式对土壤有机碳、全氮和全磷的影响 | |
| 引用本文： | 李亚娟,曹广民,龙瑞军.不同草地利用方式对土壤有机碳、全氮和全磷的影响[J].草原与草坪,2012,32(5):26-29,35. |
| 作者姓名： | 李亚娟 曹广民 龙瑞军 |
| 作者单位： | 1. 甘肃农业大学草业学院／草业生态系统教育部重点实验室／甘肃省草业工程实验室／中-美草地畜牧业可持续发展研究中心,甘肃兰州,730070 2. 中国科学院西北高原生物研究所,青海西宁,810008 3. 兰州大学草地农业科技学院,甘肃兰州730020／青藏高原生态系统管理国际中心,甘肃兰州730020 |
| 基金项目： | 国家自然科学基金项目，中国科学院战略性先导科技专项 |
| 摘 要： | 以青海省共和县塔拉滩封育芨芨草(Achnatherum splendens)草原、过牧芨芨草草原、取土坑、人工草地和农田为研究对象,对不同利用方式及不同深度下土壤有机碳、全氮、全磷含量进行了分析研究。结果表明:0～10cm和10～20cm土层土壤有机碳含量顺序均为封育芨芨草草原>退化过牧芨芨草草原>取土坑>农田>人工草地,说明退化和开垦均导致表层土壤有机碳含量的下降。在同一土层内,农田和人工草地(退耕地)的有机碳含量差异不显著(P>0.05)。在0～10,10～20和20～40cm的3个土层,农田的全氮含量最高,人工草地次之,主要是由于人为施加氮肥和翻压枯草等因素造成,取土坑的全氮含量最低;同时,0～40cm的土层,封育芨芨草草原的土壤全氮含量高于退化过牧芨芨草草原,40～80cm的土层,封育芨芨草草原的土壤全氮含量低于退化过牧芨芨草草原,说明封育使土壤上层的全氮含量增加,而草原退化导致氮向下层转移。全磷含量的变化规律与全氮相似。各草地的有机碳、全氮和全磷含量随土壤深度增加而下降。 |
| 关 键 词： | 退化草地 有机碳 全氮 全磷 |
Effects of grassland using models on soil carbon,nitrogen and phosphorus content |
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| Institution: | LI Ya-juan,CAO Guang-min,LONG Rui-jn,(1.College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/SinoU.S.Centers for Grazingland Ecosystem Sustainability,Lanzhou 730070,China;2.Northwest Plateau Institution of Biology,Chinese Academy of Sciences,Xining,Qinhai Province 810008,China; 3.College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou,Gansu Province 730020,China;4.International Center for Tibetan Plateau Ecosystem Management,Lanzhou,Gansu Province 730020,China) |
| Abstract: | The five grassland using models,enclosed achnatherum splendens grassland,degraded achnatherum splendens grassland,excavating pit,artificial grassland and farmland,were selected to test the effects of different using model on soil carbon,nitrogen and phosphorus content in Tara beach,Gonghe County,Qinghai Province.The results showed that soil organic carbon content in 0-10 cm and 10-20 cm as follow tendency： enclosed achnatherum splendensdegraded schnatherum splendens grasslandexcavating pitfarmland and artificial grassland,which illustrated the degradation and reclamation caused to organic carbon content in topsoil decrease.In same soil layer,there was no significant difference of soil organic carbon content between farmland and artificial grassland.In 0-10 cm,10-20 cm and 20-40 cm,nitrogen content in farmland was the highest,then artificial grassland.it was mainly because of nitrogen fertilization and dead grass burying.Total nitrogen in excavating pit（now the artificial restoration） was the lowest.Total nitrogen in the 0-40 cm layer in enclosed achnatherum aplendens grassland was higher than degraded achnatherum splendens grassland,but it was reversed in the 40-80 cm layer,which illustrated the enclosure inreased soil total nitrogen,and degradation may lead to nitrogen transfer to the lower soil layor.The total phosphorus content changed similarly with total nitrogen.Soil total organic carbon,nitrogen and phosphorus were all decreased with soil depth. |
| Keywords: | degraded grassland soil organic carbon total nitrogen total phosphorus |
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