• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Soil Research >Allocation into soil organic matter fractions of 14C captured via photosynthesis by two perennial grass pastures. (Special Issue: Soil carbon in Australia's agricultural lands.)
【24h】

Allocation into soil organic matter fractions of 14C captured via photosynthesis by two perennial grass pastures. (Special Issue: Soil carbon in Australia's agricultural lands.)

机译：通过两个多年生草场的光合作用将 14 C分配到土壤有机质中。 （特刊：澳大利亚农业用地的土壤碳。）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Perennial grass pastures are being increasingly adopted, but little is known about the flows of carbon (C) from photosynthesis into soil organic matter (SOM) that could be used for calculations in carbon accounting. Repeat-pulse labelling of perennial grass pastures (kikuyu and Rhodes grass) with 14C in the field in Western Australia was used to trace the allocation of C to SOM fractions and to determine the stability of each fraction over an extended period. For kikuyu, >40% of the 14C fed to the plants was allocated belowground within 10 days of labelling, and after 1 year half of this remained. Allocation of 14C belowground under Rhodes grass ranged between 20 and 24% of 14C applied and remained constant for up to 6 months. At least 90% of the 14C belowground was found in the surface 300 mm of soil. The allocation of 14C to the coarse (50 micro m-2 mm) and fine (<50 micro m) SOM fractions was similar in magnitude for the two grasses and remained stable through time. It was estimated that in 1 year ~1t C ha-1 was assimilated into the coarse+fine SOM fractions under kikuyu. However, Rhodes grass was not uniformly distributed across the paddock, thereby reducing the estimates of assimilation of C belowground in these systems to one-tenth of that under kikuyu. Data obtained will help validate plant-soil models for assessing rates of C sequestration under perennial pastures. .
机译：多年生草场正在被越来越多地采用，但是对于从光合作用到土壤有机质（SOM）的碳（C）流量可用于计算碳核算的了解很少。在西澳大利亚州的田间使用 14 C对多年生草场（kikuyu和Rhodes草）进行重复脉冲标记，以追踪C在SOM组分中的分配，并确定每个组分在土壤中的稳定性延长时间。对于菊菊，在标记后的10天内，将超过40％供给植物的 14 C分配到地下，一年后剩下一半。在Rhodes草下地下 14 C的分配范围为施用的 14 C的20％至24％，并且在6个月内保持不变。在地下300 mm的土壤中至少发现90％的 14 C。在两个草中， 14 分别分配给粗（50 micro m-2 mm）和细（<50 micro m）SOM组分的大小相似，并且随时间保持稳定。估计在kikuyu条件下，在1年内〜1t C ha -1 被同化为粗粒+细粒SOM馏分。但是，罗兹草在围场中分布不均匀，因此将这些系统中地下C的同化估计减少到kikuyu下的十分之一。获得的数据将有助于验证植物土壤模型，以评估多年生牧场下的固碳速率。 。

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