CLDAS和GLDAS土壤温度数据在陕西省的适用性评估     

刘佩佩  宋海清  鲍炜炜  李静睿 《气象科技》2021,49(4):604-611

利用陕西省2016年97站逐日5cm土壤温度观测数据,结合相关系数、平均偏差和均方根误差等统计参数,评估了中国气象局陆面数据同化系统CLDAS2.0和美国全球陆面数据同化系统不同陆面模式(Noah-GLDAS2.1,Noah-GLDAS1,CLM-GLDAS1)土壤温度数据在陕西省的适用性。结果表明:(1)CLDAS2.0在陕西省的相关系数最高,均方根误差最小,Noah-GLDAS2.1次之,Noah-GLDAS1最差。(2)从陕西省3个区域的时间演变序列的分析可以看到,CLDAS2.0和Noah-GLDAS2.1能很好模拟出土壤温度的季节变化以及日变化,Noah-GLDAS1、CLMGLDAS1对于日变化的模拟较差,且前两者偏差也明显小于后两者。(3)Noah-GLDAS2.1在陕北与关中地区土壤温度模拟能力与CLDAS2.0相差无几,但在陕南地区CLDAS2.0要好于Noah-GLDAS2.1。总体来看,CLDAS2.0对陕西省土壤温度模拟能力最好,在陕西省有着更好的适用性。  相似文献   

辽宁省农业干旱监测预报业务系统的设计与实现     

李辑  刘东明  李荣平  李雨鸿  张微玮  李晶 《气象科技》2020,48(5):640-647

为了提高农业干旱的监测预测服务能力,减少农业干旱对社会生产生活的影响,通过对干旱信息的采集、存储、加工处理和干旱产品的制作发布等环节进行梳理与完善,构建辽宁省农业干旱监测预报业务系统,实现了对农业干旱的一体化、精细化和定量化监测和预测,实现了干旱产品的标准化、自动化制作和发布。该系统依托农业干旱监测技术、遥感干旱监测技术、农业干旱预报技术等手段,实现了观测数据的收集存储、干旱信息的展示分析和干旱产品的制作发布等功能,并形成了省、市、县一体化干旱服务体系。最终实现对干旱的全方位监测、立体化服务模式,从而提高应对干旱灾害的防灾减灾能力。该系统的业务化应用提高了农业干旱监测预测的定量化、自动化和智能化水平,提升了地面和卫星遥感干旱监测预测的业务能力。该系统构建的省市县一体化服务模式,形成了省级农业气象业务中心统一制作干旱产品,省、市、县3级同时开展精细化干旱指导服务的体系。  相似文献   

生态足迹分析的资源产量法研究     

谢鸿宇  刘年丰  姚瑞珍  宋巍巍 《武汉大学学报(信息科学版)》2006,31(11):1018-1021

提出以资源生产量作为生态足迹分析中生态容量计算依据的资源产量法。该方法更全面地考虑了林地、可耕地、水域等具有的多重生态生产性功能，扩大了生态容量的内涵，将可再生能源、可回收利用废物等作为生态容量的供给，使生态容量与生态足迹的计算依据更为协调。以湖北省襄樊市2001年的生态容量计算为实例，说明了资源产量法的合理性。  相似文献   

金川软岩蠕变破坏机理电镜实验研究   总被引：1，自引：0，他引：1  

汪为巍  曹平 《岩土工程技术》2007,21(2):60-63

为探讨金川矿岩石蠕变破坏机理,应用微观扫描电镜(SEM)对蠕变受力情况下岩石破坏断口微观形态进行了观察研究,并分析了其产生的微观破坏机制。结果表明:岩石蠕变断裂的微观机制主要是拉伸、剪切作用下岩石发生脆性断裂,从岩石断裂微观形态研究岩石蠕变断裂,可以更好的揭示岩石断口微观形貌特征、裂纹生核、扩展、及断裂方式与岩石蠕变演进过程的联系。  相似文献   

盐井二次定向对接连通施工工艺     

沙亚南  谢卫炜 《中国煤田地质》2007,19(A01):48-49,58

新汶矿业集团泰山盐化工ZJ03-PJ03井组为一对定向连通采卤井井组，采用二次定向钻井连通施工工艺，技术套管下入深度907．6m（8矿层顶板），有效地阻隔了上部含较多杂质的岩盐矿层，确保了卤水质量能满足盐化工的需要。本对接连通井组，采用随钻测量井斜、方位及钻进轨迹控制技术，为该井组的顺利对接提供了技术保障。  相似文献   

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林松建  丁学仁  陈为伟  陈祥熊 《大地测量与地球动力学》2009,29(5):27-32

?о???1996??2005??????????52????С?????????????6????????????????????????????????????????????????????????????P???????NW????300??320???????У??????????????????????????????????????????????????????????????????????????????????仯?????????????????????????????????????NNW????????????總?????????????NWW????EW????  相似文献   

长江口及其邻近海域大型底栖动物生物量、丰度和次级生产力的初步研究   总被引：8，自引：0，他引：8  

刘勇  线薇薇  孙世春  吴耀泉 《中国海洋大学学报(自然科学版)》2008,38(5)

为了解长江口及邻近海域大型底栖动物生物量、丰度和次级生产力的分布情况于2004年2月、5月、8月和11月共4个航次分别在长江口40个观测站采集大型底栖动物定量样品并利用Brey的经验公式对大型底栖动物栖息丰度、生物量、次级生产力和P/B值进行了研究计算.该调查海域共采到大型底栖动物202种,其中多毛类102种,软体动物51种,甲壳类27种,棘皮动物7种,其它动物15种.大型底栖动物年平均丰度为394.7 ind/m2;年平均生物量以去灰分干重计,为2.58 g(AFDW)/m2;年平均次级生产力以去灰分干重计,为3.52 g(AFDW)/(m2*a);P/B值平均为1.53.结果表明,长江口大型底栖动物次级生产力自长江入海口向东呈递增趋势.本文分析了长江口及其邻近海域大型底栖动物优势种的组成,主要生态类群的分布特征和次级生产力分布格局与生态环境的关系.通过比较,发现长江口大型底栖动物优势种发生了较大的变化;次级生产力高于东海而低于渤海和胶州湾;P/B值高于南黄海、胶州湾和渤海,也说明了长江口大型底栖动物群落中个体小、生活史短,代谢快的种类所占的比例高于以上海域.  相似文献   

Application of the TEM and IP method to the prospecting in the Hahaigang Cu polymetallic ore area of Mozhugongka County, Tibet     

XIAN Shi-sheng 《矿产与地质》2008,22(5)

  相似文献   

The Effect of Temperature on Growth and Energy Budget of the Polychaete,Neanthes japonica Izuka     

LIU Yong ）  ）    XIAN Weiwei ）  ） Key Laboratory of Marine Ecology  Environmental Sciences  Institute of Oceanology  Chinese Academy of Sciences  Qingdao  P. R. China ） College of Fisheries  Ocean University of China  Qingdao  P. R. China 《中国海洋大学学报(英文版)》2009,8(2)

Growth and energy budget of the polychaete, Neanthesjaponica, at various temperatures (17, 20, 23, 26 and 29 ℃) were investigated in this study. The growth, as indicated by final dry weight and specific growth rate (SGR), increased with increasing temperature, with the maximum level at 26℃, and then decreased significantly at 29℃. A similar trend was observed in feeding rate, food conversion efficiency (FCE) and apparent digestive rate (ADR). However, no significant differences were detected in ADR among all the temperature treatments. In the pattern of energy allocation, faeces energy was only a small component of energy budget and had little influence on the proportion of food energy allocated to growth. The metabolic energy accounted for a large portion of energy intake for each temperature treatment. The nitrogen excretion was appreciable with changing temperature. The two expendi-ture terms (respiration energy and excretion energy) in energy budget were the major factors influencing the proportion of food en-ergy allocated to growth. These results revealed that temperature affected the growth of N. japonica mainly by influencing feeding rate and FCE. In addition, regression equations describing the relationship between feeding rate, faecal production, SGR, FCE and temperature were obtained. The optimum temperatures for feeding rate, FCE and SGR were estimated at 25.01 ℃, 24.24℃ and 24.73 ℃, respectively, from the regression equations.  相似文献   

Effects of diet and body size on phosphorus utilization of Liza haematocheila T. ＆ S.   总被引：1，自引：0，他引：1  

康斌  线薇薇  武云飞 《中国海洋湖沼学报》2008,26(2):157-161

A 21-d laboratory experiment was conducted to study, the phosphorus （P） utilization of two different diets by redlip mullet Liza haematocheila T. ＆ S. Sand-filtered water in salinity 30 and temperatare 25℃ was used. Twenty-nine fish individuals were divided into three groups： 11 to group 1 （G1） fed on diet 1, 11 to group 2 （G2） fed on diet 2, and 7 to contrast group. Diet 1 was a commercial feed, more valuable in nutrition than diet 2 that similar to natural detritus. The results show the intake phosphorus （IP） of G1 was significantly higher than that of G2, and both increased linearly with body size at a certain amount of diet. The retention phosphorus （RP） in fish of G1 was lower than G2. The relationship between retention phosphorus and body size was positive and stronger in G2. Significant difference in faecal phosphorus （FP） was found between G1 and G2. Body size significantly impacted the excretion phosphorus （EP） in G1 but G2. The loss of intake phosphorus in G1 was 10.83-20.27 mg per g fish weight gain, higher than that in G2 for 6.63-9.56. Of the phosphorus, about 10% was allocated into growth, 50% in faeces, and the rest lost in excretion. The main part of phosphorus was lost in faeces but excretion. The phosphorus budget of the fish could be described as 100IP = 7.40RP ＋ 47.39FP ＋ 36.63EP （Diet 1） or 100IP = 11.93RP ＋ 56.64FP ＋ 21.76EP （Diet 2）.  相似文献