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Soil pH Dynamics and Nitrogen Transformations Under Long-Term Chemical Fertilization in Four Typical Chinese Croplands

文献类型： 外文期刊

作者： Meng Hong-qi 1 ; Xu Ming-gang 2 ; Lu Jia-long 1 ; He Xin-hua 4 ; Li Jian-wei 5 ; Shi Xiao-jun 6 ; Peng Chang 7 ; Wang Bo- 1 ;

作者机构： 1.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Peoples R China

2.Chinese Acad Agr Sci, Key Lab Crop Nutr & Fertilizat, Minist Agr, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

3.Henan Polytech Univ, Inst Resources & Environm, Jiaozuo 454010, Peoples R China

4.Univ Western Australia, Sch Plant Biol, Nedlands, WA 6009, Australia

5.Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA

6.Southwest Univ, Coll Resources & Environm, Chongqing 400716, Peoples R China

7.Jilin Acad Agr Sci, Inst Soil

关键词： available nutrients;ecosystem;long-term fertilization;N distribution;soil pH

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2013 年 12 卷 11 期

页码：

收录情况： SCI

摘要： Long-term fertilization experiment provides the platform for understanding the proton budgets in nitrogen transformations of agricultural ecosystems. We analyzed the historical (1990-2005) observations on four agricultural long-term experiments in China (Changping, Chongqing, Gongzhuling and Qiyang) under four different fertilizations, i.e., no-fertilizer (control), sole chemical nitrogen fertilizer (F-N), sole chemical phosphorous and potassium fertilizers (F-PK) and chemical nitrogen, phosphorous and potassium fertilizers (F-NPK). The significant decline in topsoil pH was caused not only by chemical N fertilization (0.29 and 0.89 Delta pH at Gongzhuling and Qiyang, respectively) but also by chemical PK fertilization (0.59 Delta pH at Gongzhuling). The enhancement of available nutrients in the topsoil due to long-term direct nutrients supply with chemical fertilizers was in the descending order of available P (168-599%)>available K (16-189%)>available N (9-33%). The relative rate of soil pH decline was lower under long-term judicious chemical fertilization (-0.036-0.034 Delta pH yr(-1)) than that under long-term sole N or PK fertilization (0.016-0.086 Delta pH yr(-1)). Long-term judicious chemical fertilization with N, P and K elements decreases the nutritional limitation to normal crop growth, under which more N output was distributed in biomass removal rather than the loss via nitrate leaching. We concluded that the N distribution percentage of nitrate leaching to biomass removal might be a suitable indicator to the sensitivity of agricultural ecosystems to acid inputs.

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