Soil resilience and recovery: rapid community responses to management changes
Soil resilience and recovery: rapid community responses to management changes
复制标题
DOI：
10.1007/s11104-016-3068-x
复制
发表时间：
2017-03-01
期刊：
影响因子：
4.9
通讯作者：
Clark, Ian M.
中科院分区：
文献类型：
--
作者：
Hirsch, Penny R.;Jhurreea, Deveraj;Clark, Ian M.
背景和目标 土壤退化是一个重大的全球性问题；为了调查土壤生物群恢复的潜力和相关的关键功能，在永久草地、耕作和裸露休耕（通过定期耕作维持）之间转变的最初几年对土壤进行了监测。上次转换后 50 年后，土壤性质的明显差异变得明显。方法将以前的永久草地、耕地和裸露休耕土上的小块土地转换为两种替代方案，产生 9 个处理。测量了土壤特性（土壤有机碳、中型动物、微生物群落结构和活性）。结果 2年后，在先前裸露的休耕土壤上生长植物的中型动物和微生物丰度增加，而在草地转变为裸露休耕处理的情况下中型动物和微生物丰度下降。总体原核生物群落组成与新处理相比，与转换后的地块的先前处理更加相似，但某些群体和功能基因的相对丰度发生了显着变化。转为草地四年后，转为草地的耕地和裸露休耕土壤的 SOC 显着增加。结论 转为永久草地有效补充了先前退化土壤中的 C；土壤微生物组显示出与转化相关的显着变化；植物驱动的恢复比没有植物的情况下碳损失更快。
Background and aims Soil degradation is a major global problem; to investigate the potential for recovery of soil biota and associated key functions, soils were monitored during the early years of conversion between permanent grassland, arable cropping and bare fallow (maintained by regular tilling). Distinct differences in soil properties had become apparent 50 years after a previous conversion.Methods Subplots on previously permanent grassland, arable and bare fallow soil were converted to the two alternatives, generating 9 treatments. Soil properties (soil organic carbon, mesofauna, microbial community structure and activity) were measured.Results After 2 years, mesofauna and microbial abundance increased where plants were grown on previously bare fallow soils and declined where grassland was converted to bare fallow treatment. Overall prokaryote community composition remained more similar to the previous treatments of the converted plots than to the new treatments but there were significant changes in the relative abundance of some groups and functional genes. Four years after conversion, SOC in arable and bare fallow soils converted to grassland had increased significantly.Conclusions Conversion to permanent grassland effectively replenished C in previously degraded soil; the soil microbiome showed significant conversion-related changes; plant-driven recovery was quicker than C loss in the absence of plants.