...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biology and Fertility of Soils >Soil fertility breakdown in a subtropical South African vertisol site used as a home garden
【24h】

Soil fertility breakdown in a subtropical South African vertisol site used as a home garden

机译：南非亚热带亚细粉化土壤用作家庭花园的土壤肥力分解

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soil samples were taken at three depths (0–10, 10–20, 20–30 cm) from an old home garden site, subtropical South Africa (KwaZulu Natal Province), exhibiting symptoms of soil fertility breakdown, and from a new garden site, used formerly as extensive grassland. The aims of our study were to investigate (1) whether soil fertility breakdown is reflected by soil biological indices and (2) whether these indices provide information for improving the situation. The bulk density was significantly larger at the old garden site, with an average of 1.25 g cm-3 in comparison to 1.04 g cm-3 at the new garden site. Also the soil pH was significantly higher at the old garden site, with an average of 5.6 in comparison to 4.0 at the new garden site. Soil organic C and all soil microbial indices declined markedly with depth. If the concentrations were converted to the total amounts stored per hectare at 0- to 30-cm depth, soil organic C was only 10% greater (18.9 versus 17.2 t) at the new garden site, but microbial biomass C was 110% (1,680 vs 790 kg) and ergosterol even 220% greater (5.1 vs 1.6 kg). The microbial biomass C to soil organic C ratio ranged from 0.25% to 1.10%, declined markedly with depth and was almost twice as high at the new garden site. The metabolic quotient qCO2 revealed strong depth-specific variations of between 18 and 38 mg CO2-C day-1 g-1 microbial biomass C at the old garden site on a two to three times higher level than at the new garden site. Soil micro-organisms are much more strongly affected by compaction than by acidification at the present two sites. Whether land use practices led to the increase in bulk density at the old garden site or to the decrease in soil pH at the new garden site is still not fully understood. For these reasons, it is very difficult to recommend a feasible melioration plan.
机译：从一个旧的家庭花园站点，亚热带南非（夸祖鲁纳塔尔省）的三个深度（0–10、10–20、20–30 cm）采集土壤样品，这些土壤样本表现出土壤肥力下降的症状，并且是从一个新的花园站点采集的，以前用作广阔的草原。我们研究的目的是调查（1）土壤生物学指标是否反映了土壤肥力的下降，以及（2）这些指标是否为改善状况提供了信息。旧花园场地的容重明显更大，平均密度为1.25 g cm-3 ，而新花园场地为1.04 g cm-3 。同样，旧花园场地的土壤pH值显着更高，平均为5.6，而新花园场地为4.0。土壤有机碳和所有微生物指标均随深度显着下降。如果将浓度转换为0到30厘米深度处每公顷存储的总量，则新花园场地的土壤有机碳仅增加10％（18.9对17.2吨），而微生物生物量C为110​​％（1,680） 790公斤）和麦角固醇增加220％（5.1公斤1.6公斤）。微生物量碳与土壤有机碳的比例在0.25％至1.10％之间，随着深度的增加而显着下降，几乎是新花园场地的两倍。代谢商qCO2 在老花园场地的18-38 mg CO2 -C day-1 g-1 微生物生物量C处表现出强烈的深度差异。比新花园高出两到三倍。在目前的两个地点，压实比酸化对土壤微生物的影响要大得多。土地使用方式是导致旧花园场地的堆积密度增加还是导致新花园场地的土壤pH值降低尚不完全清楚。由于这些原因，很难建议可行的改善计划。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号