Effects of reduced nitrogen inputs on crop yield and nitrogen use efficiency in a long-term maize-soybean relay strip intercropping system

被引：117

作者：

Chen, Ping ^{[1
,2
]}

Du, Qing ^{[1
,2
]}

Liu, Xiaoming ^{[1
,2
]}

Zhou, Li ^{[1
,2
]}

Hussain, Sajad ^{[1
,2
]}

Lei, Lu ^{[3
]}

Song, Chun ^{[2
]}

Wang, Xiaochun ^{[1
,2
]}

Liu, Weiguo ^{[1
,2
]}

Yang, Feng ^{[1
,2
]}

Shu, Kai ^{[1
,2
]}

Liu, Jiang ^{[1
,2
]}

Du, Junbo ^{[1
,2
]}

Yang, Wenyu ^{[1
,2
]}

Yong, Taiwen ^{[1
,2
]}

机构：

[1] Sichuan Agr Univ, Coll Agron, Chengdu, Sichuan, Peoples R China

[2] Sichuan Agr Univ, Minist Agr, Key Lab Crop Ecophysiol & Farming Syst Southwest, Sichuan Engn Res Ctr Crop Strip Intercropping Sys, Chengdu, Sichuan, Peoples R China

[3] Renshou Weather Bur, Meishan, Peoples R China

来源：

PLOS ONE | 2017年 / 12卷 / 09期

基金：

中国国家自然科学基金;

关键词：

INTERSPECIFIC INTERACTIONS; PHOSPHORUS APPLICATION; FOOD SECURITY; N-2; FIXATION; ROOT LENGTH; SOIL N; WHEAT; COMPETITION; GROWTH; PEA;

D O I：

10.1371/journal.pone.0184503

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The blind pursuit of high yields via increased fertilizer inputs increases the environmental costs. Relay intercropping has advantages for yield, but a strategy for N management is urgently required to decrease N inputs without yield loss in maize-soybean relay intercropping systems (IMS). Experiments were conducted with three levels of N and three planting patterns, and dry matter accumulation, nitrogen uptake, nitrogen use efficiency (NUE), competition ratio (CR), system productivity index (SPI), land equivalent ratio (LER), and crop root distribution were investigated. Our results showed that the CR of soybean was greater than 1, and that the change in root distribution in space and time resulted in an interspecific facilitation in IMS. The maximum yield of maize under monoculture maize (MM) occurred with conventional nitrogen (CN), whereas under IMS, the maximum yield occurred with reduced nitrogen (RN). The yield of monoculture soybean (MS) and of soybean in IMS both reached a maximum under RN. The LER of IMS varied from 1.85 to 2.36, and the SPI peaked under RN. Additionally, the NUE of IMS increased by 103.7% under RN compared with that under CN. In conclusion, the separation of the root ecological niche contributed to a positive interspecific facilitation, which increased the land productivity. Thus, maize-soybean relay intercropping with reduced N input provides a very useful approach to increase land productivity and avert environmental pollution.

引用

页数：19

共 47 条

[1] Contribution of relay intercropping with legume cover crops on nitrogen dynamics in organic grain systems [J].