globalchange  > 气候变化事实与影响
CSCD记录号: CSCD:6331105
论文题名:
温湿度对不同管理方式高寒草甸土壤氮矿化的影响
其他题名: Effects of temperature and moisture on nitrogen mineralization under different management practices in alpine meadow
作者: 杜薇1; 孙楠2; 周古月1; 武山梅1; 聂成1; 李悦1; 刘颖慧1
刊名: 草原与草坪
ISSN: 1009-5500
出版年: 2018
卷: 38, 期:4, 页码:509-517
语种: 中文
中文关键词: 氮矿化 ; 土壤温度 ; 土壤湿度 ; 放牧 ; 高寒草甸
英文关键词: soil nitrogen mineralization ; soil temperature ; soil moisture ; grazing ; alpine meadow
WOS学科分类: AGRICULTURE MULTIDISCIPLINARY
WOS研究方向: Agriculture
中文摘要: 对那曲地区高寒草甸禁牧样地与放牧样地的土壤进行取样,并在室内培养,设置了5个温度梯度(5、10、15、20、25℃)和2个湿度梯度(40%、60%土壤饱和含水量),培养41 d,期间取样3次测定土壤无机氮及其他养分含量指标。那曲高寒草甸土壤无机氮的主要组成为硝态氮,硝态氮占无机氮的比例在不同培养阶段分别为80.2%,94.5%和95.9%;两种管理方式下土壤氮矿化量与温度均呈显著正相关,禁牧条件下与湿度呈较弱正相关,放牧条件下与湿度呈显著负相关。随着培养时间的变化,土壤氮矿化量与温度的相关性均增强,与湿度相关性减弱。土壤净氮矿化速率与温度均呈显著正相关, 25℃时均值为1.91 mg /(kg·d),分别比20、15、10、5℃时高70.7%、174.3%、168.6%、308.3%;土壤净氮矿化速率与湿度的相关性较弱。温度与湿度在禁牧条件培养前期对土壤净氮矿化速率有显著交互作用,此条件下的最适温湿度响应模型为N =-14.905-0.011T + 62.247M + 0.005T2-60.02M~2-0.145TM。
英文摘要: This study investigated the effects of temperature,moisture and grazing on soil nitrogen mineralizationto understand the impact of human activities on soil nitrogen mineralizationand provide a reference for predicting the effects of climate change on soil nitrogen mineralization in Naqu prefecture of Tibetan. Soil samples were collected from two kinds of sample areas (grazing prohibition and grazing plot) in an alpine meadow in Naqu prefecture of Tibetan. Then laboratory incubation with five different temperature gradients (5, 10, 15, 20 and 25 ℃) and two different moisture levels (40% and 60% saturated soil moisture, SSM) were conducted. Soil were sampled three times to determinesoil inorganic nitrogen and other nutrient contents during the 41 days of incubation period. Results showed that the main component of soil inorganic nitrogen is nitrate nitrogen, and the ratio of nitrate nitrogen to inorganic nitrogen is 80.2%, 94.5% and 95.9% in different incubation stages, respectively. Soil mineral nitrogen production were significantly positively correlated to the temperature and was weakly positively correlated with moisture in grazing prohibition plot and significantly negatively correlated to moisture in grazing plot. With the change of incubation time, the correlation between soil mineral nitrogen production and temperature increased, and the correlation with moisture decreased under two management practices. Soil net nitrogen mineralization rate was weakly correlated to the moisture but was significantly positively related to the temperature and reached the maximum of 1.91 mg /(kg·d) at 25℃,which was 70.7%, 174.3%, 168.6%, 308.3% higher than that at 20, 15, 10,5 ℃, respectively. There weresignificant interactions between the temperature and moisture on net nitrogen mineralization in the early stage of grazing prohibition conditions and the optimal models was N =-14.905-0.011T +62.247M +0.005T2-60.02M2-0.145TM. Fitting exponential model suggested that the substrate quality in grazing plot was better than in grazing prohibition plot and the temperature sensitivity was lower in grazing plot. There was no significant difference on soil net nitrogen mineralization rate between the two plots. The temperature rise will accelerate the process of soil nitrogen mineralization, which will increase the inorganic nitrogen content in soil fora short time,while the effect of humidity will not be significant under the tendency of increasing the temperature and precipitation. Studies have shown that moderate grazing is a more reasonable method of land use in the region. It not only helps to make full use of grassland resources, but also better responds to the effects of global climate change.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/153785
Appears in Collections:气候变化事实与影响

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作者单位: 1.北京师范大学地理科学学部, 地表过程与资源生态国家重点实验室, 北京 100875, 中国
2.中国农业科学院农业资源与农业区划研究所, 耕地培育技术国家工程实验室, 北京 100081, 中国

Recommended Citation:
杜薇,孙楠,周古月,等. 温湿度对不同管理方式高寒草甸土壤氮矿化的影响[J]. 草原与草坪,2018-01-01,38(4):509-517
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