Soil microorganism biomass and respiration and the soil nematode community were observed in the hypersaline desert valley that is found between the Dead Sea and the Red Sea. The lowest point of the valley is approxima...Soil microorganism biomass and respiration and the soil nematode community were observed in the hypersaline desert valley that is found between the Dead Sea and the Red Sea. The lowest point of the valley is approximately 400 m below sea level, and is the lowest point on earth. Soil samples (n = 72) were collected from the 0-10 and 10-20 cm soil layers at different altitudes (from -400 to +100 m) in the open spaces between plants during one of the most extreme xeric periods. Both soil microbial respiration and microbial biomass were found to be negatively dependent on soil moisture (SM) and organic matter (OM), and positively dependent on pH values. The physical-chemical characteristics of this hypersaline area were extremely unfavorable for the soil nematode communities, and the nematodes were entirely absent in the open area below sea level. The bacterivores were found to be the most resistant nematodes in this hyperarid region, with the Wilsonema being the most widespread genus. We suggest that nitrogen availability may play a crucial role in the below-ground soil interaction in this region, with bacterivore nematodes as indicators of nitrogen availability.展开更多
专业数字集群(PDT:Professional Digital Trunking)标准协议无法满足较大数量终端在规定的较短时间内周期上报卫星定位数据的使用要求,为此,提出一种基于组呼文本短消息上拉与专用数据信道上报相结合的高效的卫星定位数据上报方法。首...专业数字集群(PDT:Professional Digital Trunking)标准协议无法满足较大数量终端在规定的较短时间内周期上报卫星定位数据的使用要求,为此,提出一种基于组呼文本短消息上拉与专用数据信道上报相结合的高效的卫星定位数据上报方法。首先通过有线调度终端发起终端定位数据上拉请求,然后PDT系统封装定位数据上拉组呼文本短消息并发送给目标终端,最后目标终端按序在专用数据信道上报卫星定位数据。通过实验仿真,证明了方法的有效性和可行性。展开更多
文摘Soil microorganism biomass and respiration and the soil nematode community were observed in the hypersaline desert valley that is found between the Dead Sea and the Red Sea. The lowest point of the valley is approximately 400 m below sea level, and is the lowest point on earth. Soil samples (n = 72) were collected from the 0-10 and 10-20 cm soil layers at different altitudes (from -400 to +100 m) in the open spaces between plants during one of the most extreme xeric periods. Both soil microbial respiration and microbial biomass were found to be negatively dependent on soil moisture (SM) and organic matter (OM), and positively dependent on pH values. The physical-chemical characteristics of this hypersaline area were extremely unfavorable for the soil nematode communities, and the nematodes were entirely absent in the open area below sea level. The bacterivores were found to be the most resistant nematodes in this hyperarid region, with the Wilsonema being the most widespread genus. We suggest that nitrogen availability may play a crucial role in the below-ground soil interaction in this region, with bacterivore nematodes as indicators of nitrogen availability.
文摘专业数字集群(PDT:Professional Digital Trunking)标准协议无法满足较大数量终端在规定的较短时间内周期上报卫星定位数据的使用要求,为此,提出一种基于组呼文本短消息上拉与专用数据信道上报相结合的高效的卫星定位数据上报方法。首先通过有线调度终端发起终端定位数据上拉请求,然后PDT系统封装定位数据上拉组呼文本短消息并发送给目标终端,最后目标终端按序在专用数据信道上报卫星定位数据。通过实验仿真,证明了方法的有效性和可行性。