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961.
台湾海峡1997年夏季和1998年冬季两航次颗粒有机碳研究 总被引:8,自引:0,他引:8
1997~1998年台湾海峡两个航次的数据表明,颗粒有机碳(POC)的平均含量为0.120±0.009mg/dm3,表层POC浓度在夏季和冬季分别存在几个高值区。POC在随深度变化的剖面分布图中,最大值出现在10m层,底层水明显受再悬浮影响,这一剖面的变化规律普遍存在于整个海区及不同季节。夏季POC的深度变化幅度要显著大于冬季,这与垂直混合作用有关。POC与Chl-a相关性较差,暗示以Chl-a估算浮游植物的不确定性及POC产生及来源的复杂性。 相似文献
962.
A first estimate of organic carbon storage in Holocene lake sediments in Alberta, Canada 总被引:1,自引:0,他引:1
I.D. Campbell C. Campbell D.H. Vitt D. Kelker L.D. Laird D. Trew B. Kotak D. LeClair S. Bayley 《Journal of Paleolimnology》2000,24(4):395-400
This paper reports a first estimate of the Holocene lake sediment carbon pool in Alberta, Canada. The organic matter content of lake sediment does not appear to depend strongly on lake size or other limnological parameters, allowing a simple first estimate in which we assume all Alberta lake sediment to have the same organic matter content. Alberta lake sediments sequester about 15 g C m-2 yr-1, for a provincial total of 0.23 Tg C yr-1, or 2.3 Pg C over the Holocene. Alberta lakes may represent as much as 1/1700 of total global, annual permanent carbon sequestration. 相似文献
963.
964.
Preliminary study on the dissolved and colloidal organic carbon in the Zhujiang River estuary 总被引:3,自引:0,他引:3
INTRODUCTIONEstuariescompriseamajorbiogeochemicalinterfaceconnectingthelandandthesea (Man toura,1 987) .Thebehaviorandfateofaparticularriver bornesubstanceintroducedintoanestuaryisdeterminedtoalargeextentbythebiogeochemicalpropertiesofthesubstanceaswellasp… 相似文献
965.
INTRODUCTIONMarinemicroalgaeacquiretheirinorganiccarbonforphotosynthesisfromseawaterwhereinorganiccarbonmaybepresentasfreeCO2 ,H2 CO3andHCO-3 andCO2 -3 .TheproportionsofdifferentDICformsareprimarilyrelatedtopH ,andtotemperatureandsalinitytoalessextent.ThetotalDICisashighas2mmol Linseawa terbutthisismainlyintheformofHCO-3 .InnormalpHrangeof7.8-8.2inseawater,HCO-3 accountsfororethan 90 %ofthetotalDIC,whilefreeCO2 islessthan1 % .TheequilibriumconcentrationoffreeCO2 isonly1 2 μm… 相似文献
966.
The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay. In the Kongnan area, the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian Formation. During that period,the lakes were sealed, uncommunieated with the sea water and the paleoclimate was very warm and wet in Kongnan area. Analyzing the content of the trace element and the rare earth element, carbon and oxygen isotope in the disquisition, The authors prove the two views correct. 相似文献
967.
DONG Weihua YIN Xiuqin 《中国地理科学(英文版)》2007,17(2):166-172
Earthworms are the important constituents in the decayed food web and the main ecological conditioners in the process of decomposition and nutrient mineralization. The transformation of organic carbon (C) and total nitrogen (N) in the broad-leaved litters ingested by earthworms was researched by means of a laboratory experiment. Experimental samples were collected from broad-leaved Korea Pine mixed forest in Liangshui National Natural Reserve (47°10′50″N, 128°53′20″E) in the northeastern Xiao Hinggan Mountains of Northeast China. The contents of organic C and total N in earthworms, leaf litters and earthworm faeces were analyzed. Results show that the organic C content was in the fol- lowing order: leaf litters>faeces>earthworms, while total N content was contrary to that of the organic C. The organic C contents in the different leaf litters were in the following order: Tilia amurensis>Betula costata>Acer mono, whereas the total N contents in the different leaf litters were: Betula costata>Tilia amurensis>Acer mono. The contents of organic C and total N in the faeces from the different leaf litters were almost consistent with the contents of the leaf litters. After the leaf litters were ingested by earthworms, the organic C, which was transformed to increase earthworms' weights, ac- counted for 3.90%-13.31% of the total ingestion by earthworms, while that in the earthworm faeces accounted for 6.14%-13.70%. The transformed organic C through the other metabolism (e.g., respiration) of earthworms accounted for 75.04%-89.92%. The ingested organic C by earthworms was mostly used for metabolic activities. The N ingested by earthworms was less than organic C. It is estimated that 37.08% of total N was transformed to increase the earthworm's weight, 19.97% into earthworm faeces and 47.86% for the consumption of the earthworm's activities. The earthworms not only increased the content of organic C and total N in the soil, but also decreased the values of C/N in the soil and leaf litters. Earthworms play a major role in the leaf litters' decomposition and transformation. 相似文献
968.
969.
大气环境卫星温室气体和气溶胶协同观测综述 总被引:1,自引:0,他引:1
人类排放的温室气体和气溶胶是造成全球气候变暖和大气环境恶化的主要因素,也是大气环境卫星遥感的核心探测目标。与传统的单一探测目标卫星相比,实现同平台的大气温室气体和气溶胶协同监测,对于提高温室气体卫星反演精度、改善“自上而下”碳源汇估算、提升温室气体和气溶胶的人为/自然源区分能力具有重要意义,也是各国航天机构积极发展的空间探测手段。本文对欧、日、中、美等具备温室气体和气溶胶协同监测能力的卫星进行系统的介绍,包括卫星平台、传感器、处理算法和质控验证。按照卫星监测任务和传感器用途,将其分为大气综合探测卫星和温室气体监测卫星两大类,并从碳中和行动和大气环境综合治理等需求出发,提出温室气体和气溶胶协同观测星座(GACOC)的概念及其发展方向,包括主被动卫星组网观测、温室气体和气溶胶高精度联合反演算法、人为排放源识别和定量监测等应用。 相似文献
970.