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温室气体的研究,是全球变化研究计划的主要内容之一.目前人们对土壤温室气体排放的监测积累了一些资料,但对土壤内部,尤其是土壤深部温室气体的了解还很少.我国西北地区广泛分布有巨厚的黄土沉积物,这些沉积物实际上是干旱半干旱气候条件下,一种成土作用较弱的古土壤.研究黄土沉积物深部气体组分的含量与分布,有助于全面了解土壤温室气体的排放机理.本文就此问题作初步探讨.1 采样与实验方法样品的采集借助于胜利石油管理局麻花钻机进行.该钻机的主要特点是使钻头前部与钻孔隔离,以使被收集的气体不与大气混合,钻入的最大深度为2.7m,它利用钻杆中间的毛细管(下部通过钻头附近的毛细孔与土壤相通,上部出口用特制橡皮密封)负压原理,用注射器直接收集土壤气体.盛装土壤气体的气样瓶是标准的密封铝合金瓶,采样前已将气样瓶抽真空至2×1.33 322Pa.土样的采集是借助钻杆螺旋形状,将某一深度上的土样返至地表获得.我们对陕西渭南黄土地层L2～SO中的气体及土样进行了采集.采样时间为1995年2月21日～22日.3个采样地点位于桥头镇附近彼此相距10～20km的3块麦田旁.在每一个采样地点,布置4～10个钻孔(钻孔之间的距离最大不超过70m,最小为0.5m).每一钻孔中,按不同深度取1～3个土壤气体及同一深度上的土样,一般是?
Research on greenhouse gases is one of the main contents of the research project on global change.At present, some data have been accumulated on the monitoring of soil greenhouse gas emissions, but little is known about the greenhouse gases inside the soil, especially the deep soil. The widespread distribution of thick loess sediments, these sediments is actually arid and semi-arid climatic conditions of a weak paleosolification of soil.Studies on the content and distribution of deep gas components in loess sediments, contribute to A comprehensive understanding of the mechanism of soil greenhouse gas emissions.This paper made a preliminary discussion on this issue.1 Sampling and Experimental Methods The sample collection was carried out by Shengli Petroleum Administration Twist Drill .The main feature of the drill is to isolate the front of the drill from the borehole to So that the collected gas is not mixed with the atmosphere, the maximum depth of drilling into 2.7m, which uses the middle of the drill pipe capillary (the lower part of the hole near the drill bit through the soil and soil, the upper part of the export with a special rubber seal) negative pressure principle The syringes directly collect the soil gas.The gas sample bottle containing the soil gas is a standard sealed aluminum alloy bottle, which has been evacuated to 2 × 1 .33 322Pa. The sampling of soil samples was obtained by returning the soil samples at a certain depth to the ground surface with the aid of the helical shape of the drill pipe. We collected the gas and soil samples from L2 ~ SO in Weinan loess layer in Shaanxi Province. The sampling time was February 21-22, 1995. The three sampling sites are located next to the three wheat fields 10 to 20 km apart from each other near Qiaotou Town, with 4 to 10 holes drilled at each sampling location (the largest distance between bores Not more than 70m, a minimum of 0.5m.) Each borehole, according to different depths of 1 to 3 soil gas and soil samples at the same depth, is generally?