Plant facilitation shifts along with soil moisture and phosphorus gradients via rhizosphere interaction in the maize-grass pea intercropping system

作者：Shuang‐Guo Zhu, Zheng‐Guo Cheng, Asfa Batool, Yibo Wang, Jing Wang, Rui Zhou, Aziz Khan, Saiyong Zhu, Yu‐Miao Yang, Wei Wang, Hao Zhu, Bao‐Zhong Wang, Hong‐Yan Tao, You‐Cai Xiong · 发表于：Ecological Indicators · 年份：2022 · DOI：10.1016/j.ecolind.2022.108901 · 被引用次数：29 · 研究领域：Agronomic Practices and Intercropping Systems、Plant Parasitism and Resistance、Legume Nitrogen Fixing Symbiosis

Plant-plant facilitation is widely studied to increase productivity and resource utilization in cereal-legume intercropping system. However, physiological and ecological mechanisms driving interspecific interaction shift along the environmental gradients is largely unknown. To clarify this issue, we first tested plant-plant facilitation along with four phosphorus (P) gradients in maize-grass pea intercropping system. Results illustrated a progressive transition of seed yield-based facilitation from mutually facilitated (+/+) to maize facilitated but grass pea as facilitator (+/-) along with low to high P gradients. Secondly, above trend was evidently enhanced when combining with drought stress gradients, in which severe drought amplified facilitative effects, whereas the magnitude of facilitation was relatively weak under well-watered condition. Interestingly, biomass-based facilitation transition did not synchronize with seed-based one, in which occurred in a broader threshold range of water and P gradients. Specifically, total yield, biomass, N and P uptake increased by 0.5%, 4.1%, 1.8% and 2.9% under the sufficient P and water availability, whereas these indicators increased by 25.3%, 18.5%, 20.5% and 21.4% in P and water deficient soils. And the total net effect was positive under all the environmental conditions. Rhizosphere interaction plays a crucial role in facilitation judgment, and the driving mechanism was associated with soil acidification and microbial community ...