青藏高原东缘高寒草甸土壤氮矿化初探
Soil N Mineralization of An Alpine Meadow in Eastern Qinghai-Tibetan Plateau
查看参考文献22篇
|
文摘
|
通过对甘南州境内高寒草甸在4个放牧强度（禁牧、轻牧、中牧和重牧）和5个海拔梯度（3050,3180,3570,3600,3910 m）下的土壤氮矿化速率分析测定,并对室内和原位培养所得净氮矿化率进行比较,以期为确定该区合理的草地放牧管理措施,以及深入研究和系统评价高寒草甸生态系统碳、氮循环提供基础依据。结果表明:原位培养下,放牧强度的增强促进了土壤氮的矿化;室内培养所得土壤净氮矿化率大于原位培养净氮矿化速率,说明在适宜温度和湿度（22℃和40%60%的田间持水量）条件下,氮矿化速率较高;作为土壤质量的一种度量,土壤氮矿化潜力在禁牧处理下较高（0.53 mg.kg-1.d-1）,而在重牧处理下较低（0.36 mg.kg-1.d-1）;随着海拔升高,氮矿化潜力呈"V"字型变化,而原位培养下的氮矿化率与海拔梯度呈显著负相关关系（R=-0.672,P<0.01）。处于强度放牧下的草地土壤氮素周转加快,造成土壤氮素水平下降;现阶段高海拔区土壤可看作养分的储存库,如果气候变化加剧,该养分库可能变成温室气体的源。 |
|
其他语种文摘
|
This study reports an understanding of the N mineralization in soil of an alpine meadow in Qinghai-Tibet Plateau(Gannan Tibetan Autonomous Prefecture,Gansu Province),the net N mineralization rates in soil under four grazing treatments(No grazing,Light grazing,Moderate grazing and Heavy grazing)were determined from both indoor and in-situ incubation.The net N mineralization rates in soil from 5 different altitudes(which are 3050,3180,3570,3600,3910 m)were also determined.Results showed that the net N mineralization rate obtained from the indoor incubation was larger than that from the in-situ incubation,which indicated that the N mineralization rate was increased under appropriate temperature and moisture.Grazing increased the N mineralization under the in-situ incubation.Soil N mineralization potential was higher under the no-grazing treatment(0.53 mg·kg-1·d-1),and lower under the heavily-grazing treatment(0.36 mg·kg-1·d-1)compared to control.The N mineralization potential showed a "V" type with the elevation increasing.The net N mineralization rate in soil under in-situ incubation was negatively correlated with elevation(R=-0.672,P<0.01).Conclusions are that severe grazing accelerates the turnover rate of nitrogen in soil,thus causes the soil nitrogen level decreasing.Therefore,the high altitude soil may be the nutrient pool at present. |
|
来源
|
草地学报
,2011,19(3):420-424 【扩展库】
|
|
关键词
|
放牧强度
;
海拔梯度
;
净氮矿化
;
青藏高原
|
|
地址
|
1.
中国科院西北高原生物研究所, 青海, 西宁, 810008
2.
兰州大学干旱与草地生态重点实验室, 甘肃, 兰州, 730000
3.
西藏大学农牧学院, 西藏, 林芝, 860000
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1007-0435 |
|
学科
|
农业基础科学 |
|
基金
|
国家自然科学基金重点项目
;
国家自然科学基金面上项目
|
|
文献收藏号
|
CSCD:4216024
|
参考文献 共
22
共2页
|
|
1.
吴田乡. 放牧对内蒙古典型草原生态系统植物及土壤δ~(15)N的影响.
植物生态学报,2010,34(2):160-169
|
被引
19
次
|
|
|
|
|
2.
高英志. 放牧对草原土壤的影响.
生态学报,2004,24(4):790-797
|
被引
180
次
|
|
|
|
|
3.
李香真. 不同放牧率对草原植物与土壤C,N,P含量的影响.
草地学报,1998,6(2):90-98
|
被引
115
次
|
|
|
|
|
4.
Hart S C. Transferring soils from high-tolow-elevation forests increases nitrogen cycling rates:climate change implications.
Global Change Biology,1999,5:23-32
|
被引
19
次
|
|
|
|
|
5.
王其兵. 气候变化对草甸草原土壤氮素矿化作用影响的实验研究.
植物生态学,2000,24(6):687-692
|
被引
1
次
|
|
|
|
|
6.
Charles T. Measured forest soil C stocks and estimated turnover times along an elevation gradient.
Geoderma,2006,136:342-352
|
被引
1
次
|
|
|
|
|
7.
Gao Y H. Grazing intensity impacts on carbon sequestration in an Alpine Meadow on the eastern Tibetan Plateau.
Research Journal of Agriculture & Biological Science,2007,3(6):642-647
|
被引
4
次
|
|
|
|
|
8.
Han G D. Effect of grazing intensity on carbon and nitrogen in soil and vegetation in a meadow steppe in Inner Mongolia.
Agriculture Ecosystem & Environment,2008,125:21-32
|
被引
47
次
|
|
|
|
|
9.
吴建国. 气候变化对青藏高原高寒草甸适宜气候分布范围的潜在影响.
草地学报,2009,17(6):699-705
|
被引
16
次
|
|
|
|
|
10.
王瑞永. 不同海拔高度高寒草地土壤理化指标分析.
草地学报,2009,17(5):621-628
|
被引
34
次
|
|
|
|
|
11.
陈懂懂. 青藏高原东北缘不同海拔梯度土壤微生物量与氮矿化的潜力.
兰州大学学报(自然科学版),2010,46(3):86-90
|
被引
8
次
|
|
|
|
|
12.
任继周.
草业科学研究方法,1998:207-211
|
被引
13
次
|
|
|
|
|
13.
Smith J L. Soil properties and microbial activity across a 500 m elevation gradient in a semi-arid environment.
Soil Biology & Biochemistry,2002,34(11):1749-1757
|
被引
30
次
|
|
|
|
|
14.
Gao Y H. Impacts of grazing intensity on nitrogen pools and nitrogen cycle in an alpine meadow on the eastern Tibetan plateau.
Applied Ecology & Environmental Research,2008,6(3):69-79
|
被引
6
次
|
|
|
|
|
15.
Wu H H. Feedback of grazing on gross rates of N mineralization and inorganic N partitioning in steppe soils of Inner Mongolia.
Plant & Soil,2011,340(1/2):127-139
|
被引
9
次
|
|
|
|
|
16.
Rossignol N. Consequence of grazing pattern and vegetation structure on the spatial variations of net N mineralization in a wet grassland.
Applied Soil Ecology,2006,31:62-70
|
被引
8
次
|
|
|
|
|
17.
Deenik J. Nitrogen mineralization potential in important agricultural soils of Hawaii.
Soil Crop Management,2006,15:1-5
|
被引
5
次
|
|
|
|
|
18.
Mazzarino M J. Soil nitrogen dynamics in northeastern Patagonia steppe under different precipitation regimes.
Plant & Soil,1998,202:125-131
|
被引
18
次
|
|
|
|
|
19.
Maithani K. Nitrogen mineralization as influenced by climate,soil and vegetation in subtropical humid forest in northeast India.
Forest Ecology & Management,1998,109(1/3):91-101
|
被引
21
次
|
|
|
|
|
20.
房开瑞. 由水沸点温度推测海拔高度和大气压力的简易方法.
中国计量,2010,3:93
|
被引
1
次
|
|
|
|
|
了解气象卫星更多信息，请访问