Plant carbon sequestration is an effective way to abate the global warming. However, the field-scale carbon exchange on a peach orchard remains unclear. Here, using an eddy covariance technique, the net ecosystem carb...Plant carbon sequestration is an effective way to abate the global warming. However, the field-scale carbon exchange on a peach orchard remains unclear. Here, using an eddy covariance technique, the net ecosystem carbon dioxide exchange and energy balance were analyzed on a coarse-sand-field, no-tillage, 12-year-old-peach orchard. The results showed that during full flowering, the ability to sequestrate carbon was significant, it reached on the peak of-0.33 mg （CO2） m^-2 s^-1. During rapid growth, the Bowen ratio was under 0.3 and daily net carbon sequestration reached on the peak of-25.1 g （CO2） m^-2 d^-1. During the leaf fall stage, there is a great deal of CO2 emissions, the peak value of carbon sequestration reached ＋0.60 mg （CO2） m^-2 s^-1. During monitoring period, the daily average of net carbon sequestration and Bowen ratio was 1.22 ± 1.56 and -2.90 ± 6.63 g （CO2） m^-2 d^-1, respectively. The net carbon sequestration could reach -1,052 g （CO2） m^-2 in a year. These results reveal that there is high carbon sequestration on a coarse-sand-field, no-tillage peach orchard.展开更多
文摘目的探讨江门市新会区石场存在的矽尘、噪声危害程度。方法依据国家有关标准,对石场工作场所的矽尘、噪声进行检测,并对检测结果进行分析。结果 2011—2013年各石场的粉尘中游离二氧化硅含量在10.0%-39.4%之间,矽尘浓度在〈0.67-50 mg/m^3之间,矽尘超标率为84.3%-90.6%;噪声强度在68.2-101.4 d B（A）之间,噪声超标率为59.0%-90.5%;不同工作岗位矽尘浓度差异有统计学意义（t=3.456,P〈0.05）;疑似尘肺病和噪声聋检出率分别为3.76%和11.27%。结论江门市新会区石场的噪声、矽尘危害较为严重,应继续加大监督监测与健康教育。
基金This work was supported by National Key Technology Supported Program of China （Project 2008BAD95B07, 2011BAD32B03）, the China National Natural Science Foundation （Project 31040006）.
文摘Plant carbon sequestration is an effective way to abate the global warming. However, the field-scale carbon exchange on a peach orchard remains unclear. Here, using an eddy covariance technique, the net ecosystem carbon dioxide exchange and energy balance were analyzed on a coarse-sand-field, no-tillage, 12-year-old-peach orchard. The results showed that during full flowering, the ability to sequestrate carbon was significant, it reached on the peak of-0.33 mg （CO2） m^-2 s^-1. During rapid growth, the Bowen ratio was under 0.3 and daily net carbon sequestration reached on the peak of-25.1 g （CO2） m^-2 d^-1. During the leaf fall stage, there is a great deal of CO2 emissions, the peak value of carbon sequestration reached ＋0.60 mg （CO2） m^-2 s^-1. During monitoring period, the daily average of net carbon sequestration and Bowen ratio was 1.22 ± 1.56 and -2.90 ± 6.63 g （CO2） m^-2 d^-1, respectively. The net carbon sequestration could reach -1,052 g （CO2） m^-2 in a year. These results reveal that there is high carbon sequestration on a coarse-sand-field, no-tillage peach orchard.
