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| 黄土丘陵区不同植被类型下土壤与微生物C,N,P化学计量特征研究 | |
| 引用本文： | 吴建平,韩新辉,许亚东,任成杰,杨改河,任广鑫.黄土丘陵区不同植被类型下土壤与微生物C,N,P化学计量特征研究[J].草地学报,2016,24(4):783-792. |
| 作者姓名： | 吴建平 韩新辉 许亚东 任成杰 杨改河 任广鑫 |
| 作者单位： | 1. 西北农林科技大学农学院, 陕西 杨陵 712100; 2. 陕西省循环农业工程技术研究中心, 陕西 杨凌 712100 |
| 基金项目： | 国家自然科学基金项目(41301601)，国家林业公益性行业科研专项(201304312) |
| 摘 要： | 对刺槐林、柠条林、酸桃-柠条混交林、撂荒地和耕地等植被类型的土壤微生物生物量及土壤碳（C），氮（N），磷（P）化学计量比的变化特征进行分析。结果表明：与耕地相比，在植被恢复中土壤及微生物C，N，P显著增加，表现为：刺槐林 >柠条林 >混交林 >撂荒地 >耕地，土壤微生物量碳（Microbial Biomass Carbon，MBC），微生物量氮（Microbial Biomass Nitrogen，MBN），微生物量磷（Microbial Biomass Phosphorus，MBP）含量变化较土壤C，N，P明显。微生物碳增幅62.78%~366.90%；微生物氮增幅85.48%~737.24%；微生物磷增幅67.83%~167.14%，土壤及微生物C，N，P随土层深度增加呈递减趋势。另外，土壤及微生物C，N，P的化学计量比值也受植被类型和土壤层次垂直分布的影响，表现为C/N为7.21~15.56，均值9.67；C/P为2.36~8.50，均值5.78；N/P为0.26~0.96，均值0.61，MBC/MBN比为5.14~54.34，均值9.36；MBC/MBP比为9.73~40.32，均值28.68；MBN/MBP比为0.19~4.96，均值3.35；且与土壤及微生物C，N，P间均呈显著相关。另外，土壤N/P及MBN/MBP偏低，而磷素含量充足，表明黄土丘陵区植被恢复主要受氮素营养限制。土壤及微生物C，N，P含量变化与植被类型和土壤层次垂直分布存在密切关系且植被恢复对土壤质量得到了极大的改良。 |
| 关 键 词： | 黄土丘陵区 植被类型 土壤微生物生物量 化学计量特征 |
| 收稿时间： | 2015-10-23 |
Ecological Stoichiometry of Soil and Soil Microbial Biomass C,N, P under Grain-to-Green Program in Loess Hilly Region |
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| WU Jian-ping,HAN Xin-hui,XU Ya-dong,REN Cheng-jie,YANG Gai-he,REN Guang-xin.Ecological Stoichiometry of Soil and Soil Microbial Biomass C,N, P under Grain-to-Green Program in Loess Hilly Region[J].Acta Agrestia Sinica,2016,24(4):783-792. | |
| Authors: | WU Jian-ping HAN Xin-hui XU Ya-dong REN Cheng-jie YANG Gai-he REN Guang-xin |
| Institution: | 1. College of Agronomy, Northwest A & F University, Yangling, Shaanxi Province 712100, China; 2. The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China |
| Abstract: | In this study, the research was carried out in Loess Hilly Region of typical erosive environment. The arable land selected as the control, the changes of soil microbial biomass carbon, nitrogen, phosphorus content and soil C, N, P stoichiometric ratio of the Robinia pseudoacacia L. forest, Caragana korshinskii Lam. shrubbery, mixed forests, and abandoned land were analyzed. The results showed that the content of soil microbial biomass C, N, P presented a significant increase compared with arable land of ecological degradation, and the increasing rate presented a trend of the Robinia pseudoacacia >the Caragana korshinskii >mixed forests >abandoned land >arable land. The measure of returning arable land to forests had been significantly and quickly improved soil microbial biomass. Furthermore, microbial biomass C, N and P increased in the range of 62.78%~366.90%, 85.48%~737.24%, 67.83%~167.14%, respectively. Meanwhile, soil C, N, P and soil microbial biomass C, N, P decreased with increasing soil depth. In addition, soil C, N, P and microbial biomass C, N, P stoichiometric ratio was also influenced by vegetation types and vertical distribution levels, and the range of variation C/N ratio was from 7.21 to 15.56, with an average of 9.67; variation range C/P ratio from 2.36 to 8.50, with an average of 5.78; changes range N/P from 0.26 to 0.96, with an average of 0.61, as well as, the range of variation MBC/MBN ratio from 5.14 to 54.34, with an average of 9.36; variation range MBC/MBP ratio from 9.73 to 40.32, with an average of 28.68; changes range MBN/MBP from 0.19 to 4.96, with an average of 3.35. Soil C/N, C/P, N/P ratio and soil microbial biomass C, N, P elements showed a significant correlation relationship. In addition, soil N/P and MBN/MBP ratio were relatively low and phosphorus content was high. It indicated that vegetation restoration in Loess Hilly Region was main nitrogen nutrient limitation. Soil C, N, P and soil microbial biomass content variation had a positive relationship with vegetation types and vertical distribution levels, and vegetation restoration had the potential to improve soil quality. |
| Keywords: | Loess Hilly Region Vegetation types Soil microbial biomass Stoichiometry |
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