| 草原化荒漠区中间锦鸡儿灌丛土壤线虫群落 |
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| 引用本文： | 宋承承,梅续芳,张鹏,王业林,王德凯,解李娜,马成仓.草原化荒漠区中间锦鸡儿灌丛土壤线虫群落[J].草业科学,2021,38(3):580-589. |
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| 作者姓名： | 宋承承 梅续芳 张鹏 王业林 王德凯 解李娜 马成仓 |
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| 作者单位： | 天津师范大学生命科学学院 / 天津市动植物抗性重点实验室,天津 300387 |
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| 基金项目： | 国家自然科学基金(31901140、31570453)。 |
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| 摘 要： | 为了探究灌木对土壤线虫群落的影响,采用湿漏斗法(Baermann法),调查了内蒙古草原化荒漠区中间锦鸡儿(Caragana intermedia)灌丛内和灌丛外不同土层(0?10、10?20、30?40 cm)土壤线虫群落组成结构。结果表明:1)中间锦鸡儿灌丛显著提高了灌丛内表层土土壤线虫总数(P<0.05),但对其物种数和Shannon-Wiener指数影响不显著(P>0.05);随着土壤深度的增加,灌丛内土壤线虫总数和Shannon-Wiener指数逐渐减少。2)中间锦鸡儿灌丛显著增加了表层土食细菌和食真菌线虫总数;土壤深度显著影响食细菌、植物寄生和杂食捕食线虫总数(P<0.05),且无论是灌丛内还是灌丛外,均表现为表层土或次表层土最多。3)中间锦鸡儿灌丛显著影响自由生活线虫成熟度指数/植物寄生线虫成熟度指数(maturity index/plant parasitic index,PPI/MI)比值(P<0.05),表现为灌丛外大于灌丛内;土壤深度对其影响不显著(P>0.05)。4)随着土壤深度的增加,中间锦鸡儿灌丛内土壤线虫向居住者类型(persister,cp3–cp5)转变;而灌丛外向殖民者类型(colonizer,cp1或cp2)转变。冗余分析(RDA)结果表明,速效磷(P)和速效钾(K)是影响土壤线虫群落的主要环境因子,且不同属和不同营养类群的土壤线虫对环境的响应不同。
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| 关 键 词： | 线虫群落 多样性指数 功能性指数 top-down效应 草原化荒漠 中间锦鸡儿 |
Effects of Caragana intermedia on soil nematode communities in a steppe desert region |
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| SONG Chengcheng,MEI Xufang,ZHANG Peng,WANG Yelin,WANG Dekai,XIE Li'na,MA Chengcang.Effects of Caragana intermedia on soil nematode communities in a steppe desert region[J].Pratacultural Science,2021,38(3):580-589. |
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| Authors: | SONG Chengcheng MEI Xufang ZHANG Peng WANG Yelin WANG Dekai XIE Li'na MA Chengcang |
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| Institution: | (Tianjin Key Laboratory of Animal and Plant Resistance/College of Life Sciences,Tianjin Normal University,Tianjin 300387,China) |
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| Abstract: | This study examined the effect of shrubs on soil nematode communities.We took the dominant shrub species Caragana intermedia in the Inner Mongolia steppe desert area as the target plant and investigated the soil nematode communities composition and structure under C.intermedia shrub canopies and in open areas at different soil depths(0?10,10?20,30?40 cm)using the wet funnel method(Baermann method).The results showed that 1)The total number of soil nematodes in the top soil layer was higher under C.intermedia shrub canopies than in the open areas,but the species richness and Shannon-Wiener index were not significantly different between the canopy conditions(P>0.05).The total number and Shannon-Wiener index of the soil nematodes decreased as the soil depth increased.2)The number of bacterialfeeder and fungal-feeder nematodes in the top soil layer was higher under the shrub canopies than in open areas.Soil depth significantly affected the total number of bacterial-feeder,plant-parasitic,and omnivorous-predation nematodes,and their total numbers were highest at the soil surface and in the subsurface soil layer.3)Shrubs had a significant effect on PPI/MI values(P<0.05),which showed that the values were higher in open areas than under the shrub canopies.Soil depth had no significant effect on the PPI/MI values(P>0.05).4)As the soil depth increased,the community structure of the soil nematodes changed to the resident trophic groups(persister,cp3–cp5)under the shrub canopies,and to the colonizer trophic groups(colonizer,cp1 or cp2)in open areas.The RDA analysis revealed that available P and available K are the primary environmental factors influencing soil nematode communities,and that nematodes communities belonging to different taxa and trophic groups respond to environmental conditions in different ways. |
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| Keywords: | nematode communities diversity indices functional indices top-down effects steppe desert Caragana intermedia |
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