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The Nutrient Status of Plant Roots Reveals Competition Intensities in Rubber Agroforestry Systems

文献类型： 外文期刊

作者： Wu, Junen 1 ; Zeng, Huanhuan 2 ; Zhao, Fan 2 ; Chen, Chunfeng 2 ; Jiang, Xiaojin 2 ; Zhu, Xiai 2 ; Wang, Pingyuan 2 ; Wu, 1 ;

作者机构： 1.Yunnan Normal Univ, Fac Geog, Kunming 650050, Yunnan, Peoples R China

2.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Menglun 666303, Peoples R China

3.Ctr Plant Ecol, Core Bot Gardens, Menglun 666303, Peoples R China

4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

5.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou 571737, Peoples R China

关键词： agroforestry systems; Bayesian network; belowground competition; nutrient cycling; plant nutrient allocation; plant– soil interactions

期刊名称：FORESTS （ 影响因子：2.633； 五年影响因子：2.804 ）

ISSN：

年卷期： 2020 年 11 卷 11 期

页码：

收录情况： SCI

摘要： Controversial competition theories may confuse the current understanding of belowground plant competition and thus result in incorrect diagnoses and mitigation strategies for nutrient competition. As such, the management of nutrient competition is a major challenge in the application and development of rubber agroforestry systems (AFSs). To explore the effects of plant competition on the nutrient status of rubber AFSs, this study measured the carbon, nitrogen, and phosphorus concentrations of the litter and soil and in plant leaves, stems, and roots from five rubber plantations (i.e., rubber monocultures and rubber mixed with cocoa, coffee, tea, and Flemingia macrophylla (Willd.) Merr., 1910)). The relative competition intensity indexes were calculated to evaluate the competition intensity of each mixed-species system, and Bayesian networks were established to investigate the linkage effects of interspecific competition for nutrients. This study demonstrated that rubber trees had weak competition with cocoa trees, moderate competition with F. macrophylla and tea trees, and intense competition with coffee trees. With the increase in competition intensity, the negative effects of interspecific competition on soil gradually offset the improvement in soil nutrients achieved with intercropping. Nitrogen and phosphorous translocation from the stems to the roots was enhanced by competition. However, enhanced nutrient allocation to roots may have led to insufficient nitrogen and phosphorous supplies in plant leaves. The quality of the litter therefore decreased because the nutrient status of fallen leaves determines the initial litter conditions. Such consequences may reduce the release of nutrients from the litter to the soil and thus increase soil nutrient depletion. This study revealed that competition effects were most obvious for the root nutrient status, followed by the stem and leaf nutrient statuses. Moreover, this study further demonstrated that the nutrient concentration of plant roots can better indicate the intensity of nutrient competition than the nutrient concentration of other plant organs.

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