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Intercropping enhances soil carbon and nitrogen

文献类型： 外文期刊

作者： Cong, Wen-Feng 1 ; Hoffland, Ellis 3 ; Li, Long 1 ; Six, Johan 4 ; Sun, Jian-Hao 5 ; Bao, Xing-Guo 5 ; Zhang, Fu-Suo 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

2.Wageningen Univ, Ctr Crop Syst Anal, NL-6700 AK Wageningen, Netherlands

3.Wageningen Univ, Dept Soil Qual, NL-6700 AA Wageningen, Netherlands

4.ETH, Swiss Fed Inst Technol, Inst Agr Sci, Dept Environm Syst Sci, CH-8092 Zurich, Switzerland

5.Gansu Acad Agr Sci, Inst Soils & Fertilizers, Lanzhou 730070, Peoples R China

关键词： ecosystem services;functional complementarity;intercropping;plant diversity;plant productivity;root biomass;soil carbon;soil nitrogen

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：10.863； 五年影响因子：11.716 ）

ISSN：

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收录情况： SCI

摘要： Intercropping, the simultaneous cultivation of multiple crop species in a single field, increases aboveground productivity due to species complementarity. We hypothesized that intercrops may have greater belowground productivity than sole crops, and sequester more soil carbon over time due to greater input of root litter. Here, we demonstrate a divergence in soil organic carbon (C) and nitrogen (N) content over 7years in a field experiment that compared rotational strip intercrop systems and ordinary crop rotations. Soil organic C content in the top 20cm was 4%+/- 1% greater in intercrops than in sole crops, indicating a difference in C sequestration rate between intercrop and sole crop systems of 184 +/- 86kg Cha(-1)yr(-1). Soil organic N content in the top 20cm was 11%+/- 1% greater in intercrops than in sole crops, indicating a difference in N sequestration rate between intercrop and sole crop systems of 45 +/- 10kg Nha(-1)yr(-1). Total root biomass in intercrops was on average 23% greater than the average root biomass in sole crops, providing a possible mechanism for the observed divergence in soil C sequestration between sole crop and intercrop systems. A lowering of the soil N-15 signature suggested that increased biological N fixation and/or reduced gaseous N losses contributed to the increases in soil N in intercrop rotations with faba bean. Increases in soil N in wheat/maize intercrop pointed to contributions from a broader suite of mechanisms for N retention, e.g., complementary N uptake strategies of the intercropped plant species. Our results indicate that soil C sequestration potential of strip intercropping is similar in magnitude to that of currently recommended management practises to conserve organic matter in soil. Intercropping can contribute to multiple agroecosystem services by increased yield, better soil quality and soil C sequestration.

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[1]High morphological and physiological plasticity of wheat roots is conducive to higher competitive ability of wheat than maize in intercropping systems. Liu, Yi-Xiang,Zhang, Wei-Ping,Li, Xiao-Fei,Christie, Peter,Li, Long,Sun, Jian-Hao.

[2]Contribution of interspecific interactions and phosphorus application to sustainable and productive intercropping systems. Xia, Hai-Yong,Wang, Zhi-Gang,Christie, Peter,Zhang, Fu-Suo,Li, Long,Zhao, Jian-Hua,Sun, Jian-Hao,Bao, Xing-Guo,Xia, Hai-Yong,Christie, Peter.

[3]Intercropping influenced the occurrence of stripe rust and powdery mildew in wheat. Luo, Huisheng,Jin, Ming'an,Jin, Shelin,Jia, Qiuzhen,Zhang, Bo,Huang, Jin,Wang, Xiaoming,Sun, Zhenyu,Shang, Xunwu,Cao, Shiqin,Duan, Xiayu,Zhou, Yilin,Chen, Wanquan,Liu, Taiguo.

[4]Root distribution and interactions between intercropped species. Li, L,Sun, JH,Zhang, FS,Guo, TW,Bao, XG,Smith, FA,Smith, SE.

[5]Interspecific complementary and competitive interactions between intercropped maize and faba bean. Li, L,Yang, SC,Li, XL,Zhang, FS,Christie, P.

[6]Intercropping maintains soil fertility in terms of chemical properties and enzyme activities on a timescale of one decade. Wang, Zhi-gang,Li, Xiao-fei,Jin, Xin,Christie, Peter,Li, Long,Bao, Xing-guo,Zhao, Jian-hua,Sun, Jian-hao.

[7]Dynamics of root length and distribution and shoot biomass of maize as affected by intercropping with different companion crops and phosphorus application rates. Xia, Hai-Yong,Christie, Peter,Zhang, Fu-Suo,Li, Long,Zhao, Jian-Hua,Sun, Jian-Hao,Bao, Xing-Guo,Christie, Peter.

[8]Diversity enhances agricultural productivity via rhizosphere phosphorus facilitation on phosphorus-deficient soils. Li, Long,Li, Shu-Min,Sun, Jian-Hao,Zhou, Li-Li,Bao, Xing-Guo,Zhang, Hong-Gang,Zhang, Fu-Suo.

[9]Community composition of ammonia-oxidizing bacteria in the rhizosphere of intercropped wheat (Triticum aestivum L.), maize (Zea mays L.), and faba bean (Vicia faba L.). Song, Y. N.,Marschner, P.,Li, L.,Bao, X. G.,Sun, J. H.,Zhang, F. S.. 2007

[10]Wheat/maize or wheat/soybean strip intercropping II. Recovery or compensation of maize and soybean after wheat harvesting. Li, L,Sun, JH,Zhang, FS,Li, XL,Rengel, Z,Yang, SC. 2001

[11]Effect of phosphorus application and strip-intercropping on yield and some wheat-grain components in a wheat/maize/potato intercropping system. Zhang, Enhe,Huang, Gaobao,Zhang, Lijun,Wang, Gang,Zhang, Lijun,He, Chunyu,Zhang, Bo,Wang, Qi,Qiang, Shengjun. 2011

[12]Wheat/maize or wheat/soybean strip intercropping I. Yield advantage and interspecific interactions on nutrients. Li, L,Sun, JH,Zhang, FS,Li, XL,Yang, SC,Rengel, Z. 2001

[13]Maize grain concentrations and above-ground shoot acquisition of micronutrients as affected by intercropping with turnip, faba bean, chickpea, and soybean. Xia HaiYong,Xue YanFang,Zhang FuSuo,Li Long,Zhao JianHua,Sun JianHao,Bao XingGuo,Eagling, Tristan. 2013

[14]Intercropping with wheat leads to greater root weight density and larger below-ground space of irrigated maize at late growth stages. Li, Long,Li, Long,Zhang, Fusuo,Sun, Jianhao. 2011

[15]Effect of intercropping on crop yield and chemical and microbiological properties in rhizosphere of wheat (Triticum aestivum L.), maize (Zea mays L.), and faba bean (Vicia faba L.). Song, Y. N.,Zhang, F. S.,Marschner, P.,Fan, F. L.,Gao, H. M.,Bao, X. G.,Sun, J. H.,Li, L.. 2007

[16]Effects of intercropping and nitrogen application on nitrate present in the profile of an Orthic Anthrosol in Northwest China. Li, WX,Li, L,Sun, JH,Guo, TW,Zhang, FS,Bao, XG,Peng, A,Tang, C. 2005

[17]Effects of nitrogen and phosphorus fertilizers and intercropping on uptake of nitrogen and phosphorus by wheat, maize, and faba bean. Li, WX,Li, L,Sun, JH,Zhang, FS,Christie, P. 2003

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