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首页> 外文期刊>Applied Soil Ecology >Effects of reclamation age on soil microbial communities and enzymatic activities in the sloping citrus orchards of southwestern China
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Effects of reclamation age on soil microbial communities and enzymatic activities in the sloping citrus orchards of southwestern China

机译：中国西南部柑橘果园土壤微生物群体和酶促活动的影响

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摘要

Soil fertility is of great importance to maintain the productivity and quality of fruits, particularly in slope orchards due to their vulnerability to soil erosion and nutrient losses. However, whether and how slope orchard reclamation influences soil quality, especially soil biological characteristics during orchard development, remains unclear. In this study, changes in soil microbial biomass, community composition, and activity in a Huangguogan orchard chronosequence (1, 3, 7 and 11 years after orchard reclamation) were investigated, and their related factors were determined. The effects of orchard stand age on microbial biomass varied greatly depending on the functional group examined. Additionally, orchard stand age significantly shifted the soil microbial community composition, showing an increase in fungal dominance with increasing time since reclamation. The enzymatic activity involved in soil C cycling was sensitive and increased with orchard stand age, whereas the enzymatic activity involved in N cycling was relatively stable. Moreover, the soil fertility in the 11-year-old orchards showed a detectable decrease. Further analysis suggested that the soil microbial biomass and enzymatic activities of the Huangguogan orchard were strongly correlated with the diameter at basal height and fine root biomass of the fruit trees and soil total organic carbon (TC) and nitrogen (TN). These findings indicate that the above-ground parts of the plants and the soil nutrient status are correlated with changes in the soil enzymatic activities and microbial community. This study highlights the finding that management practices that help to increase plant vigour and microbial biodiversity should be a focus of slope orchards in later reclamation stages.
机译：由于它们脆弱的土壤侵蚀和营养损失，土壤肥力是非常重要的，以维持水果的生产力和质量，特别是在坡果园。然而，无论是如何以及如何坡果园回收影响土壤质量，特别是果园发展过程中的土壤生物学特性，仍然不清楚。在这项研究中，研究了Huangguogan果树果园的土壤微生物生物量，群落组成和活性的变化进行了调查（果园回收后1,3,7和11年），确定了相关因素。果园展望时代对微生物生物量的影响取决于所检查的功能组的大大变化。此外，果园展望年度显着改变了土壤微生物群落组成，显示出在填海后提高时间的真菌优势的增加。涉及土壤C循环的酶活性敏感，随着果园的静止而增加，而参与N循环的酶活性相对稳定。此外，11岁果园的土壤肥力显示出可检测的减少。进一步的分析表明，黄格兰果园的土壤微生物生物量和酶活性与果树和土壤总有机碳（Tc）和氮气（TN）的基础高度和细根生物量的直径强烈相关。这些发现表明，植物的上述部分和土壤营养状况与土壤酶活性和微生物群落的变化相关。本研究强调了帮助增加植物活力和微生物生物多样性的管理实践应该是在后期填海阶段的坡果园的重点。

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