温度和湿度对紫花苜蓿土壤氮矿化的影响

草业学报 ›› 2010, Vol. 19 ›› Issue (4): 101-107.

温度和湿度对紫花苜蓿土壤氮矿化的影响

邹亚丽^1,2,韩方虎^1,3,耿丽英¹,沈禹颖^1*

1.兰州大学草地农业科技学院农业部草地农业生态系统学重点开放实验室,甘肃兰州 730020;

2.天水师范学院生化学院,甘肃天水 741001;
3.云南省环保局,云南昆明650032

收稿日期:2009-03-12 出版日期:2010-08-20 发布日期:2010-08-20
作者简介:邹亚丽(1971-),女,四川荣县人,讲师,硕士。E-mailzoulzu@163.com
基金资助:
国家重点基础研究发展规划(G2000018602,2007CB106804)和教育部2003年重点科技项目(103164)资助

Effects of temperature and moisture on soil nitrogen mineralization of lucerne stands

ZOU Ya-li^1,2, HAN Fang-hu^1,3, GEN Li-ying¹, SHEN Yu-ying¹

1.College of Pastoral Agriculture Science and Technology, Lanzhou University, Key Laboratory of
Grassland Agro-Ecosystems, Ministry of Agriculture, Lanzhou 730020, China;
2.School of Life
Science and Chemistry, Tianshui Normal University, Tianshui 741001, China;
3.Appraisal
Center for Environmental Engineering of Yunnan Province, Kunming 650032, China

Received:2009-03-12 Online:2010-08-20 Published:2010-08-20

摘要/Abstract

摘要： 为确定温度和水分对土壤氮矿化特征的影响,以取自甘肃庆阳黄土高原4年龄(4a)和8年龄(8a)紫花苜蓿草地0~10cm土壤为对象,在不同的温度(5,15和25℃)和水分(30%,50%和70%田间持水量)组合下进行了室内培养。结果表明温度是影响黄土高原紫花苜蓿草地土壤净氮矿化速率的主效因素,培养14d后净硝化率和净矿化率最大值均出现在25℃/70FC下,分别为0.481μg/(g·d)(4a)和0.942μg/(g·d)(8a),0.293μg/(g·d)(4a)和0.632μg/(g·d)(8a);在5℃/30FC下4a土壤的净氮固持率最大,为0.232μg/(g·d),8a土壤则在5℃/70FC下净氮固持率最大,为0.127μg/(g·d);8a苜蓿土壤培养后微生物碳含量显著高于4a苜蓿土壤,在15℃/50FC的组合下8a土壤是4a的1.44倍。土壤有机质含量不同是导致2个年龄苜蓿土壤净硝化率、净矿化率和微生物生物量碳差异的主要原因。

Abstract: The effects of temperature and moisture on nitrogen mineralization in the 0-10 cm soil layer from four years (4 a) and eight years(8 a) old lucerne stands in the Loess Plateau were determined by an incubation experiment with combinations of three temperature levels (5℃, 15℃, and 25℃) and three moistures levels (30%, 50%, and 70% of field capacity). Temperature was the dominant factor affecting net mineralization in the 0-10 cm soil layer from lucerne stands in the Loess Plateau. The highest net nitrification rates were 0.481 μg/(g·d)(4 a), 0.942 μg/(g·d)(8 a) with net mineralization rates of 0.293 μg/(g·d)(4 a), 0.632 μg/(g·d)(8 a), which were in the 25℃/70FC treatment after 14 days incubation. The highest nitrogen immobilization rate (0.232 μg/g·d) in soil from 4 a lucerne stands was in the 5℃/30FC treatment while it was 0.127 μg/(g·d) in the 5℃/70FC treatment for the 8 a stands. Microbial biomass carbon content in the 0-10 cm soil layer from 8 a lucerne stands was 1.44 times higher than that in the 4 a stands under 25℃/70FC condition. The differences of nitrogen mineralization rate and organic microbial C between two ages of lucerne soil are due to the difference of soil organic C content from the two soils.

中图分类号:

邹亚丽,韩方虎,耿丽英,沈禹颖. 温度和湿度对紫花苜蓿土壤氮矿化的影响[J]. 草业学报, 2010, 19(4): 101-107.

ZOU Ya-li, HAN Fang-hu, GEN Li-ying, SHEN Yu-ying. Effects of temperature and moisture on soil nitrogen mineralization of lucerne stands[J]. Acta Prataculturae Sinica, 2010, 19(4): 101-107.

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