南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤磷组分特征及其影响因素  

Effect of Growing of Wedelia trilobata,W.chinensis or Their Hybrid on Soil Phosphorus Fractionation in South China and Their Affecting Factors

作　　者：孙锋 曾令达 彭长连[2] 赵梦欣 SUN Feng;ZENG Lingda;PENG Changlian;ZHAO Mengxin(State Key Laboratory for Biology of Plant Diseases and Insect Pests,Beijing 100000,China;College of Life Sciences,South China Normal University,Guangzhou 510631,China;School of Life Science,Huizhou University,Huizhou,Guangdong 516001,China)

机构地区：[1]植物病虫害生物学国家重点实验室,北京100000 [2]华南师范大学生命科学学院,广州510631 [3]惠州学院生命科学学院,广东惠州516001

出　　处：《土壤学报》2021年第3期798-804,共7页Acta Pedologica Sinica

基　　金：中国博士后科学基金项目(2018M643112);植物病虫害生物学国家重点实验室开放基金项目(SKLOF201914)资助。

摘　　要：为探究入侵植物南美蟛蜞菊土壤磷转化过程与驱动机制,采用野外控制试验,比较研究了南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤磷组分、微生物生物量磷以及酸性磷酸酶和碱性磷酸酶活性。结果表明:3种蟛蜞菊土壤易分解态磷仅占全磷的2.2%~6.3%,且全碳与有机磷的比例大于200,表明本研究区受到磷限制。有机磷是土壤磷库的主要组分,在南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤中分别占全磷的28.7%、17.6%和25.0%。相关分析表明,三种蟛蜞菊土壤有机磷组分矿化主要受碱性磷酸酶影响,受酸性磷酸酶影响较小,且碱性磷酸酶与有机磷呈显著负相关,与易分解态磷呈显著正相关。因此,在缺磷的亚热带地区,碱性磷酸酶对有机磷的分解可能是该地区入侵植物对磷限制的适应机制。It is of great significance to compare exotic plants with their respective indigenous plants in growth and effect on soil properties for studies on mechanism of their successful invasion.Subtropical and tropical soils are often strongly weathered and hence low in phosphorus availability.Why can invasive plants,such as Wedelia trilobata,successfully invade South China,where the soil is deficient in phosphorus?An answer to this problem is of great significance for exploration of mechanism of the invasive plants flourishing in infertile soils.However,so far few reports on this topic have been found in the literature.This paper laid its focuses on soil organic phosphorus mineralization, and activities of acid phosphomonoesterase and alkaline phosphomonoesterase in the soils under W. trilobata, native plant W. chinensis and their hybrid in South China. A controlled field experiment using randomized complete block design was laid out in July 2016. The plots in the experiment were planted with W. trilobata, native plant W. chinensis and their hybrid, separately for comparison between the plots in microbial biomass phosphorus, activity of acid and alkaline phosphomonoesterase and soil organic phosphorus mineralization, and for analysis of underlying mechanisms of any possible differences. Results show that Treatment WT (W. trilobata) was higher than Treatment WC (W. chinensis) in soil dissolved organic carbon. In all the three treatments Labile-P accounted only for 2.2%-6.3% of the soil total phosphorus. Treatment WT and Treatment H (hybrid) was higher than Treatment WC in Labile-P, but lower in organic phosphorus, residual phosphorus, total phosphorus and microbial biomass phosphorus. Microbial biomass phosphorus made up 14.3%, 41.2% and 25.7% of the total phosphorus in Treatments WT, WC and H, respectively. The ratio of soil total carbon to organic phosphorus reached well beyond 200, indicating that soil phosphorus was a major limiting factor in the studied region. Soil organic phosphorus, as an important fraction in s

关 键 词：植物入侵 土壤磷组分 碱性磷酸酶 有机磷分解 易分解态磷 

分 类 号：S153[农业科学—土壤学]