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equivalent soil mass
相关语句
  等质量
     SOC storage on an equivalent soil mass in all treatments reflected the short-term effects of tillage more accurately.
     利用等深度(0~30cm)和等质量(4040Mg)土壤碳库储量计算方法对比研究表明,将土壤容重考虑在内的等质量土壤有机碳库储量计算方法可以更准确的反映耕作对土壤有机碳库储量的影响。
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Quality of soils developed from both pelite and granite under primary broad-leaved forest are studied on two sites where soils showed minimum anthropic disturbance in Tonggou County and Dexing County respectively in the mid sub-tropic red soil region, Jiangxi ProvinceOn each site,litter samples were collected by layers,mineral soils were sampled at 5cm depth interval in the 10cm top soil and at 10cm interval below this layer to 50cm depth after 6 sampling points were determined in random gridding methods with...

Quality of soils developed from both pelite and granite under primary broad-leaved forest are studied on two sites where soils showed minimum anthropic disturbance in Tonggou County and Dexing County respectively in the mid sub-tropic red soil region, Jiangxi ProvinceOn each site,litter samples were collected by layers,mineral soils were sampled at 5cm depth interval in the 10cm top soil and at 10cm interval below this layer to 50cm depth after 6 sampling points were determined in random gridding methods with an gridding interval of 30mThe results of the study show that soils quality under that vegetation are characterized by deep soil layer,low bulk densities,high soil organic matter and total N and CEC,but low available N,P and K in the equivalent soil mass of 350 kg/m2 of surface soilsFarther comparison of the quality indictors of soils formed from the two parent materials reveals that total soil thickness,mean soil bulk density,total organic matter,total N and pH indicate no significant statistical differences as the local ecosystem reaches its climax;While the soil quality indicators including dry weight of litter layer,total P,total K,CEC,BS,bulk density and thickness of mineral soil, and available N,P,K between them show extremely remarkable differences that reflecting the great mineralogical and chemical distinctness of their parent materials 

通过对发育于江西省中亚热带典型红壤地区泥质岩和花岗岩上天然常绿阔叶林下的土壤质量性状的研究,结果表明,天然常绿阔叶林植被下表层350kg/m2土壤的土层深厚、容重小,有机质、全N和CEC水平高,但是土壤速效养分水平低。进一步比较发现,生态系统进化到常绿阔叶林这种生态系统的顶极状态,这两种母质类型上土壤表层350kg/m2土层的总厚度、平均容重、总有机质含量、总N量和土壤pH具有趋同性;而母质性状的差异却使该土层中凋落物层干物质量及其P、K含量、矿质土层的容重与厚度、土壤BS和速效N、P、K含量表现出极显著的差异。

【Objective】The short-term effects of no-tillage(NT),moldboard plow(MP) and ridge tillage(RT) on the amount of soil organic carbon(SOC) in the plow layer(30 cm) of a black soil(clay loam) in Northeast China were studied.【Method】The tillage experiment trials were established in Dehui County,Jilin Province in 2001.Using two calculating methods based on an equivalent soil depth and soil mass SOC storages under different tillages were compared.【Result】NT practices did not lead to significant increase of SOC at the...

【Objective】The short-term effects of no-tillage(NT),moldboard plow(MP) and ridge tillage(RT) on the amount of soil organic carbon(SOC) in the plow layer(30 cm) of a black soil(clay loam) in Northeast China were studied.【Method】The tillage experiment trials were established in Dehui County,Jilin Province in 2001.Using two calculating methods based on an equivalent soil depth and soil mass SOC storages under different tillages were compared.【Result】NT practices did not lead to significant increase of SOC at the top soil(0-5 cm) compared with MP and RT practices.However,SOC contents showed a notable reduction at 5-20 cm depth.SOC storage on an equivalent soil mass in all treatments reflected the short-term effects of tillage more accurately.Three-year NT practices didn’t stratify the storage of SOC on an equivalent soil mass in the plow layer on this clay loam black soil.【Conclusion】Use of no-tillage practices on this fine-textured and poor-drained black soil might not sequester more SOC than conventional tillage,at least in the short term.

目的探索不同耕作方式对耕层黑土有机碳含量的影响。方法以2001年秋在吉林省德惠市中层黑土上进行了3年的田间定位试验小区土壤为研究对象,对免耕、垄作和秋翻3种耕作处理下耕层土壤有机碳的动态变化进行了分析,并采用等深度和等质量土壤碳库储量计算方法,比较了不同耕作处理对耕层土壤有机碳库储量的影响。结果不同耕作处理对黑土耕层有机碳的影响无显著性差异,而且免耕处理在短期内没有引起耕层土壤有机碳含量的明显增加,反而有所降低。与2001年试验开始时相比,3年免耕管理使表层0~5cm土壤有机碳含量仅增加了0.18%,而5~20cm土层有机碳含量则明显降低。利用等深度(0~30cm)和等质量(4040Mg)土壤碳库储量计算方法对比研究表明,将土壤容重考虑在内的等质量土壤有机碳库储量计算方法可以更准确的反映耕作对土壤有机碳库储量的影响。等质量方法计算表明,3年的免耕试验并没有使耕层土壤有机碳库储量发生明显变化。结论在质地粘重和排水不良的土壤上实行免耕,短期内土壤有机碳含量并没有增加。长期效果如何还有待观测。

 
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