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首页> 外文期刊>HortScience >Soil Carbon Pools, Nitrogen Supply, and Tree Performance under Several Groundcovers and Compost Rates in a Newly Planted Apple Orchard
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Soil Carbon Pools, Nitrogen Supply, and Tree Performance under Several Groundcovers and Compost Rates in a Newly Planted Apple Orchard

机译：新种植苹果园中几种地被和堆肥速率下的土壤碳库，氮供应和树木性能

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This study evaluated the effects of in-row groundcovers (bare ground, brassica seed meal, cultivation, wood chip mulch, legume cover crop, and non-legume cover crop) and three compost rates (48, 101, and 152 kg available nitrogen (N)/ha/year) on soil carbon (C) pools, biological activity, N supply, fruit yield, and tree growth in a newly planted apple (Malus domestica Borkh.) orchard. We used nonlinear regression analysis of C mineralization curves to differentiate C into active and slow soil C pools. Bare ground and cultivation had large active soil C pools, 1.07 and 0.89 g C/kg soil, respectively, but showed little stabilization of C into the slow soil C pool. The use of brassica seed meal resulted in increased soil N supply, the slow soil C pool, and earthworm activity but not total soil C and N, fruit yield, or tree growth. Legume and non-legume cover crops had increased microbial biomass and the slow soil C pool but had lower fruit yield and tree growth than all other groundcovers regardless of compost rate. Soils under wood chip mulch had elevated earthworm activity, total soil C and N, and the slow soil C pool. Wood chip mulch also had the greatest cumulative C mineralization and a high C:N ratio, which resulted in slight N immobilization. Nevertheless, trees in the two wood chip treatments ranked in the top four of the 13 treatments in both fruit yield and tree growth. Wood chip mulch offered the best balance of tree performance and soil quality of all treatments.
机译：这项研究评估了行间地被植物（裸地，芸苔种子粉，耕种，木片覆盖，豆类覆盖作物和非豆类覆盖作物）和三种堆肥率（48、101和152 kg有效氮（ N）/公顷/年）上新种植的苹果园（Malus domestica Borkh。）果园的土壤碳（C）库，生物活性，氮供应，水果产量和树木生长。我们使用了C矿化曲线的非线性回归分析，将C区分为活跃土壤C和缓慢土壤C。裸地和耕作具有较大的活性土壤碳库，分别为1.07和0.89 g C / kg土壤，但在缓慢的土壤C池中几乎没有稳定的C。使用芸苔籽粉会增加土壤氮的供应，缓慢的土壤碳库和earth的活动，但不会增加土壤碳和氮的总量，果实产量或树木的生长。豆类和非豆类覆盖作物的微生物量增加，土壤碳库缓慢，但无论堆肥率如何，其果实产量和树木生长均低于所有其他地被植物。木片覆盖下的土壤had活性升高，土壤总碳和氮含量较高，土壤碳库缓慢。木片覆盖物还具有最大的累积碳矿化度和高的C：N比，这导致了少量的N固定化。尽管如此，两种木片处理中的树木在水果产量和树木生长方面均排在13种处理的前四名中。木屑覆盖物在所有处理中都能提供树木性能和土壤质量的最佳平衡。

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