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温室农业生态系统土壤有机碳与重金属关系研究进展 被引量:2
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作者 沈乾春 王艳 +2 位作者 王欣然 张军莹 王彤 《黑龙江农业科学》 2023年第6期101-107,共7页
温室农业生态系统作为农田生态系统的一部分,因种植的高肥需求以及连作的特点导致其与农田生态系统不同,在已有的研究中,温室农业生态系统中的土壤有机碳和重金属的含量要高于农田生态系统。土壤有机碳作为土壤肥力的基础,同时还影响着... 温室农业生态系统作为农田生态系统的一部分,因种植的高肥需求以及连作的特点导致其与农田生态系统不同,在已有的研究中,温室农业生态系统中的土壤有机碳和重金属的含量要高于农田生态系统。土壤有机碳作为土壤肥力的基础,同时还影响着温室气体的排放,在生态系统碳循环中占据着重要地位。土壤重金属作为土壤重要的污染物之一,它在土壤中的富集、迁移、淋溶影响着农作物和环境的质量,还会对人体健康造成威胁。因此本文综述了土壤有机碳和土壤重金属的研究进展,以及二者在农田生态系统中的关系,为后续研究二者在温室农业生态系统中的关系做铺垫。研究表明,影响农田土壤有机碳和重金属的因素主要有大气沉降、灌溉、肥料的施用,而温室土壤的影响因素主要为有机肥的不合理施用和种植年限,虽然过量施用有机肥和增加种植年限能够有效增加土壤有机碳,但是这也造成土壤重金属在土壤中富集。土壤有机碳会络合吸附土壤中的重金属离子,并且还会引起土壤酸化,进而提高重金属的有效性和迁移性,二者之间呈现正相关性,所以合理控制土壤有机碳输入会在一定程度上减少温室农业生态系统土壤重金属的污染。 展开更多
关键词 土壤有机碳 土壤重金属 有机肥 种植年限 温室农业生态系统
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Static and Dynamic Properties of Soil Food Web Structure in a Greenhouse Environment 被引量:3
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作者 CHEN Yun-Feng CAO Zhi-Ping +1 位作者 L.POPESCU B.H.KIEPPER 《Pedosphere》 SCIE CAS CSCD 2014年第2期258-270,共13页
Soil food web structure is fundamental to ecosystem process and function; most studies on soil food web structure have focused on agro-ecosystems under different management practices and natural terrestrial ecosystems... Soil food web structure is fundamental to ecosystem process and function; most studies on soil food web structure have focused on agro-ecosystems under different management practices and natural terrestrial ecosystems,but seldom on greenhouses. This study explored the static and temporal variability of soil food structure in two greenhouses of Shandong Province,North China over a two-year period. The static properties were measured directly by surveying functional group composition and a series of parameters portraying the species properties,link properties,chain properties and omnivory properties of the web,as well as indirectly through calculation of nematode indices,enrichment index(EI),structure index(SI),and channel index(CI). The dynamic variability of greenhouse soil food structure was described by the dynamics of functional groups,Bray-Curtis(BC) similarity and cluster analysis. The results showed that the greenhouse soil food web contained 14 functional groups,with microbes having the highest mean biomass,followed by protozoa. Of the three functional groups of protozoa,flagellates were the dominant group on most sampling dates,amoebae only became the dominant group during the summer,while ciliates were the least prevalent group. All nematodes were assigned into one of the four functional groups,bacterivorous,fungivorous,herbivorous and omnivorous,and the fungivorous nematodes had the lowest mean biomass. Mites were assigned into three functional groups and the omnivorous noncryptostigmatic mites were the dominant group. All the functional groups showed significant seasonal changes. The soil food web connectance was 0.15,the maximum food chain length was 5,and the average food chain length was 3.6. The profiles of the EI and SI showed that the food web was resourcedepleted with minimal structure. The results of CI indicated that the bacterial decomposition pathway was the dominant pathway in the food web of the greenhouse soils studied and the results of BC similarity showed that the soil food web had higher variability and instability over time. The cluster analysis showed that the functional groups located at high trophic levels with low biomass were in a cluster,whereas those at low trophic levels with high biomass were closer. Compared with the food web structure of agroecosystem and natural terrestrial ecosystem soils,the structure of greenhouse soil food web was simple and unstable,which was likely driven by high agricultural intensification,particularly over application of fertilizers. 展开更多
关键词 Bray-Curtis similarity functional group MITES nematodes PROTOZOA
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