Effects of long-term continuous cropping on soil nematode community and soil condition associated with replant problem in strawberry habitat.
Effects of long-term continuous cropping on soil nematode community and soil condition associated with replant problem in strawberry habitat.
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DOI：
10.1038/srep30466
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发表时间：
2016-08-10
影响因子：
4.6
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Li X;Lewis EE;Liu Q;Li H;Bai C;Wang Y
连作改变了土壤理化参数、酶和微生物群落，造成草莓栽培中的“再植问题”。我们假设，土壤线虫群落将反映长期连作引起的土壤条件的变化，在方式是一致的和可预测的。为了验证这一假设，我们研究了草莓大棚内连续种植5个不同时期的土壤线虫群落和土壤酚酸、有机质和氮素含量。土壤pH值显著降低，四种酚酸，对羟基苯甲酸、阿魏酸、肉桂酸和对香豆酸在连作条件下随时间积累。4种酚酸对拟木蠹蛾有较高的毒力，在非连续种植中占优势的属，导致它在连续种植七年后减少为一个常驻属。线虫多样性的下降表明，由于连作的做法，生态系统的稳定性和可持续性的损失。连作条件下土壤的主要分解途径由细菌转化为真菌。研究结果表明，随着草莓栖息地连作时间的延长，土壤食物网受到干扰，植物有效营养和土壤总体健康状况恶化，这些变化可以通过土壤线虫群落来指示。沿着草莓栖息地连作时间的延长，土壤食物网受到干扰，植物有效营养和土壤总体健康状况恶化。
Continuous cropping changes soil physiochemical parameters, enzymes and microorganism communities, causing “replant problem” in strawberry cultivation. We hypothesized that soil nematode community would reflect the changes in soil conditions caused by long-term continuous cropping, in ways that are consistent and predictable. To test this hypothesis, we studied the soil nematode communities and several soil parameters, including the concentration of soil phenolic acids, organic matter and nitrogen levels, in strawberry greenhouse under continuous-cropping for five different durations. Soil pH significantly decreased, and four phenolic acids, i.e., p-hydroxybenzoic acid, ferulic acid, cinnamic acid and p-coumaric acid, accumulated with time under continuous cropping. The four phenolic acids were highly toxic to Acrobeloides spp., the eudominant genus in non-continuous cropping, causing it to reduce to a resident genus after seven-years of continuous cropping. Decreased nematode diversity indicated loss of ecosystem stability and sustainability because of continuous-cropping practice. Moreover, the dominant decomposition pathway was altered from bacterial to fungal under continuous cropping. Our results suggest that along with the continuous-cropping time in strawberry habitat, the soil food web is disturbed, and the available plant nutrition as well as the general health of the soil deteriorates; these changes can be indicated by soil nematode community.