Carbon dynamics and budget in a Zoysia japonica grassland, central Japan
Carbon dynamics and budget in a Zoysia japonica grassland, central Japan
复制标题
DOI：
10.1007/s10265-009-0289-6
复制
发表时间：
2010-07
影响因子：
2.8
通讯作者：
Deepa Dhital;Y. Yashiro;T. Ohtsuka;H. Noda;Yoko Shizu;H. Koizumi
中科院分区：
文献类型：
--
作者：
Deepa Dhital;Y. Yashiro;T. Ohtsuka;H. Noda;Yoko Shizu;H. Koizumi
对日本结缕草草地的生态系统碳预算进行了估算。绿色生物量从5月开始增长，7月中旬至9月达到高峰。土壤二氧化碳通量和根系呼吸的季节变化是由土壤温度的变化介导的。 2007年和2008年土壤CO2通量分别为1,121.4和1,213.6 g C m−2，根呼吸分别为471.0和544.3 g C m−2。根系呼吸对土壤CO2通量的贡献范围为33%至71%。在生长季节，2007 年和 2008 年的净初级生产力 (NPP) 分别为 747.5 g C m−2 和 770.1 g C m−2。 2007年和2008年，牲畜放牧去除的生物量（GL）为122.1和102.7 g C m−2，牲畜分别返回28.2和25.6 g C m−2作为粪便输入（FI）。 FI 的分解（DL，分解造成的干重损失）非常低，2007 年和 2008 年分别为 1.5 和 1.4 g C m−2。根据年 NPP、土壤 CO2 通量、根系呼吸、GL、FI 和 DL 的值，估算 2007 年草地碳收支分别为 1.7 和 22.3 g C m−2，分别为2008年。因此，thisZ 的碳预算。在研究的两年中，粳稻草原生态系统在当前放牧条件下与大气保持平衡。
The ecosystem carbon budget was estimated in a JapaneseZoysia japonicagrassland. The green biomass started to grow in May and peaked from mid-July to September. Seasonal variations in soil CO2flux and root respiration were mediated by changes in soil temperature. Annual soil CO2flux was 1,121.4 and 1,213.6 g C m−2and root respiration was 471.0 and 544.3 g C m−2in 2007 and 2008, respectively. The root respiration contribution to soil CO2flux ranged from 33% to 71%. During the growing season, net primary production (NPP) was 747.5 and 770.1 g C m−2in 2007 and 2008, respectively. The biomass removed by livestock grazing (GL) was 122.1 and 102.7 g C m−2, and the livestock returned 28.2 and 25.6 g C m−2as fecal input (FI) in 2007 and 2008, respectively. The decomposition of FI (DL, the dry weight loss due to decomposition) was very low, 1.5 and 1.4 g C m−2, in 2007 and 2008. Based on the values of annual NPP, soil CO2flux, root respiration, GL, FI, and DL, the estimated carbon budget of the grassland was 1.7 and 22.3 g C m−2in 2007 and 2008, respectively. Thus, the carbon budget of thisZ. japonicagrassland ecosystem remained in equilibrium with the atmosphere under current grazing conditions over the 2 years of the study.