华西雨屏区天然常绿阔叶林土壤可培养微生物数量对模拟氮沉降的响应
发布时间：2019-04-02 09:01
【摘要】：为了解氮沉降对华西雨屏区天然常绿阔叶林土壤微生物数量的影响,从2013年11月至2014年12月,通过野外模拟N(NH_4NO_3)沉降,氮沉降水平分别为对照(CK 0 kg N hm~(-2)a~(-1))、低氮沉降(L 50 kg N hm~(-2)a~(-1))、中氮沉降(M 150 kg N hm~(-2)a~(-1))和高氮沉降(H 300 kg N hm~(-2)a~(-1)),研究了氮沉降对天然常绿阔叶林0—10cm和10—20cm土层土壤可培养微生物数量的影响。结果表明:华西雨屏区天然常绿阔叶林0—10cm土层的细菌、真菌和放线菌数量均显著大于10—20cm土层,氮沉降未改变原有垂直分布格局。L处理对0—10cm和10—20 cm土层土壤微生物总量无显著影响,M和H处理则显著降低了土壤微生物总量。氮沉降降低了0—10cm和10—20cm土层的细菌数量,且抑制作用随氮沉降量的增加而增强。氮沉降降低了0—10cm土层的真菌数量,但下降幅度与氮沉降量之间无明显规律;在10—20cm土层,M和H处理在夏季显著增加了真菌数量,表明适量氮沉降能有效缓解夏季土壤真菌的氮限制状态。氮沉降对0—10cm土层放线菌数量的影响表现为先促进再抑制,L和M处理增加了放线菌数量,H处理降低了放线菌数量;氮沉降增加了10—20cm土层的放线菌数量,其中M处理的促进作用最大。氮沉降对土壤微生物数量的影响随土壤深度的增加而减弱。
[Abstract]:In order to understand the effect of nitrogen deposition on soil microbial quantity of natural evergreen broad-leaved forest in Yuping area of West China, the N (NH_4NO_3) deposition was simulated in the field from November 2013 to December 2014. The nitrogen deposition level was CK 0 kg N hm~ (- 2) a ~ (- 1), low nitrogen deposition (L 50 kg N hm~ (- 2) a ~ (- 1), respectively). Medium nitrogen deposition (M 150 kg N hm~ (- 2) a ~ (- 1) and high nitrogen deposition (H 300 kg N hm~ (- 2) a ~ (- 1),) The effects of nitrogen deposition on the number of soil culturable microorganisms in 0-10cm and 10-20cm soil layers of natural evergreen broad-leaved forest were studied. The results showed that the number of bacteria, fungi and actinomycetes in 0-10cm soil layer of natural evergreen broad-leaved forest in Yuping area of West China was significantly higher than that of 10-20cm soil layer. Nitrogen deposition did not change the original vertical distribution pattern, and L treatment had no significant effect on soil microbial content in 0-10cm and 10 ~ 20 cm soil layer, while M and H treatments significantly decreased soil microbial total amount. Nitrogen deposition decreased the number of bacteria in 0-10cm and 10-20cm soil layers, and the inhibition increased with the increase of nitrogen deposition. Nitrogen deposition decreased the number of fungi in 0-10cm soil layer, but there was no obvious law between the decrease extent and nitrogen deposition. In 10-20cm soil layer, M and H treatments significantly increased the number of fungi in summer, indicating that proper nitrogen deposition could effectively alleviate the nitrogen limitation of soil fungi in summer. The effect of nitrogen deposition on the number of actinomycetes in 0-10cm soil layer was first promoted and then inhibited. The number of actinomycetes was increased by L and M treatments, and decreased by H treatment. Nitrogen deposition increased the number of actinomycetes in 10-20cm soil layer, among which M treatment had the greatest promoting effect. The effect of nitrogen deposition on soil microbial quantity decreased with the increase of soil depth.
【作者单位】： 四川农业大学林学院;
【基金】：国家“十二五”科技支撑资助项目(2010BACO1A11) 四川省“十二五”农作物育种攻关资助项目(2011NZ0098-10)
【分类号】：S714
[Abstract]:In order to understand the effect of nitrogen deposition on soil microbial quantity of natural evergreen broad-leaved forest in Yuping area of West China, the N (NH_4NO_3) deposition was simulated in the field from November 2013 to December 2014. The nitrogen deposition level was CK 0 kg N hm~ (- 2) a ~ (- 1), low nitrogen deposition (L 50 kg N hm~ (- 2) a ~ (- 1), respectively). Medium nitrogen deposition (M 150 kg N hm~ (- 2) a ~ (- 1) and high nitrogen deposition (H 300 kg N hm~ (- 2) a ~ (- 1),) The effects of nitrogen deposition on the number of soil culturable microorganisms in 0-10cm and 10-20cm soil layers of natural evergreen broad-leaved forest were studied. The results showed that the number of bacteria, fungi and actinomycetes in 0-10cm soil layer of natural evergreen broad-leaved forest in Yuping area of West China was significantly higher than that of 10-20cm soil layer. Nitrogen deposition did not change the original vertical distribution pattern, and L treatment had no significant effect on soil microbial content in 0-10cm and 10 ~ 20 cm soil layer, while M and H treatments significantly decreased soil microbial total amount. Nitrogen deposition decreased the number of bacteria in 0-10cm and 10-20cm soil layers, and the inhibition increased with the increase of nitrogen deposition. Nitrogen deposition decreased the number of fungi in 0-10cm soil layer, but there was no obvious law between the decrease extent and nitrogen deposition. In 10-20cm soil layer, M and H treatments significantly increased the number of fungi in summer, indicating that proper nitrogen deposition could effectively alleviate the nitrogen limitation of soil fungi in summer. The effect of nitrogen deposition on the number of actinomycetes in 0-10cm soil layer was first promoted and then inhibited. The number of actinomycetes was increased by L and M treatments, and decreased by H treatment. Nitrogen deposition increased the number of actinomycetes in 10-20cm soil layer, among which M treatment had the greatest promoting effect. The effect of nitrogen deposition on soil microbial quantity decreased with the increase of soil depth.
【作者单位】： 四川农业大学林学院;
【基金】：国家“十二五”科技支撑资助项目(2010BACO1A11) 四川省“十二五”农作物育种攻关资助项目(2011NZ0098-10)
【分类号】：S714
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