STUDY ON THE INTERACTION BETWEEN NDVI PROFILE AND THE GROWING STATUS OF CROPS   总被引：5，自引：1，他引：4  

JIANGDong WANGNai-bin YANGXIao-huan WANGJi-hua 《中国地理科学(英文版)》2003,13(1):62-65

Daily and ten-day Normalized Difference Vegetation Index(NDVI) of crops were retrieved from meteorological statellite NOAA AVHRR images ,The temporal variations of the NDVI were analyzed during the whole growing season,and thus the principle of the interaction between NDIV profile and the growing status of crops was discussed,As a case in point,the relationship between integral NDVI and winter wheat yield of Henan Province in 1999 had been analyzed.By putting integral NDVI values of 60 sample counties into the winter wheat yield-integral NDVI coordination,scattering map was plotted. It demonstrated that integral NDVI had a close relation with winter wheat yield.These relation could be described with linear,cubic polynomial ,and exponential regression,and the cubic polynomial regression was the best way,In general ,NDVI reflects growing status of green vegetation ,so crop monitoring and crop yield estimation could be realized by using remote sensing technique on the basis of time serial NDVI data together with agriculture calendars.  相似文献   

A comparative study of the zooplankton in two adjacent embayments,Port Phillip and Westernport Bays,Australia     

William J. Kimmerer  A.David McKinnon 《Estuarine, Coastal and Shelf Science》1985,21(2):145-159

We report on a year's study of spatial and seasonal patterns of zooplankton abundance in Port Phillip and Westernport Bays, July 1982 to August 1983. These two bays, closely adjacent on the southern coast of Victoria, Australia, differ in several respects: Port Phillip is a nearly landlocked bay with a broad basin, while Westernport is an open tidal embayment with extensive mud and seagrass banks. Both bays have a resident zooplankton fauna distinct from that of Bass Strait. Although these resident communities have many species in common, patterns of abundance and dominance are quite different. We found that the holoplankton of Port Phillip was about half copepods, mostly Paracalanus indicus, with 23% Caldocera and 21% larvaceans. Westernport Bay zooplankton was dominated by Acartia tranteri, with no resident cladoceran fauna. Bass Strait species were more often found in Westernport than in Port Phillip Bay, but the resident community of Port Phillip Bay was more similar to that of Bass Strait than to that of Westernport.Although this study was undertaken in an exceptionally dry year, the available historical data show that the overall patterns found in 1982–1983 are typical for these bays. The differences in community composition probably relate to differences in depth profile, predator abundance, and suspended matter between the bays.  相似文献   

A taxonomical and ecological survey of rotiffer communities in Krottensee (Austria)     

Zhu Ge-yan 《中国海洋湖沼学报》1996,14(4):308-315

The composition and distribution of benthic, periphytic and planktonic rotifers in different habitats in Krottensee were investigated. Sixty-five rotifer taxa were identified, their relative abundance estimated. Classification of the data set by cluster analysis allowed the recognition of distinct habitat groups confined to acid bog ponds, macrophytes, sediments and open water. Five groups of rotifer taxa were identified on the basis of their habitat preferences and the occurrence of the taxa. Highest diversities were found on macrophytes and in acid bog ponds.  相似文献   

富P过铝质岩浆体系的研究现状及存在的问题     

唐勇  张辉  刘丛强  饶冰 《矿物学报》2008,28(1):35-42

高度演化的富P过铝质岩浆体系,具有鲜明的、不同于其他体系的地球化学行为.富P过铝质熔体以富P,高ASI,贫Fe、Mg、Ca,强烈亏损REE、Th、Y以及具有W、Sn、Nb、Ta等金属的矿化为特征.富P过铝质岩浆体系中的碱性长石为富P长石,长石中P可以有效地指示过铝质岩浆体系的演化历程;在岩浆演化的晚期,P与Li具强的亲和性,形成锂辉石-磷铝锂石-羟磷铝锂石的组合.已有的实验研究揭示,P能降低简单花岗岩的液相线和固相线温度、粘度以及增加H2O在熔体中的溶解度.然而,这一体系还存在许多问题亟待研究,P能否促进过铝质岩浆的液态不混溶,能否促使等价不相容元素在过铝质岩浆演化过程中的分异,是否在稀有金属成矿过程中起作用等都是值得关注的问题.  相似文献   

南海大鹏湾夜光藻种群在其生态群落中的地位和功能   总被引：5，自引：1，他引：5  

黄长江  杞桑  齐雨藻  林小涛  欧强 《海洋与湖沼》1997,28(4):348-355

分析了１９９１年上半年南海大鹏湾盐田水域夜光菏和浮游动、植物之间的种群动态关系，结果表明，在春季高峰期３月至５月初，调查海域共出现１２个夜光藻和浮游动、植物高峰。其中，以发生４次赤潮的夜光藻种群占主导地位，其次是枝角类的鸟啄尖头蚤，其最高数量高达９６２３８ｉｎｄ／ｍ＾３。相比之下，在夜光藻和枝角类岛啄尖头捕食压力的影响下，浮游植物的春季高峰并不显著。调查结果表明夜光藻的过度繁殖，不但对产浮游性卵的  相似文献   

南海区重点岸段海岸侵蚀现状成因分析与防治对策   总被引：4，自引：0，他引：4  

刘孟兰  郑西来  韩联民  林端  罗一丹  方宏达  柯东胜  彭晓娟  陈嘉辉 《海洋通报》2007,26(4):80-84

在2003年与2006年对南海区琼州海峡两岸重点岸段(雷州市徐闻县龙塘镇赤坎村岸段、海南省海口市镇海村岸段和新海村岸段)的海岸侵蚀进行了现场监测,测量了侵蚀的长度、宽度和面积。对两年现场测量结果进行比较分析,结果表明:海岸侵蚀长度的平均速度为200m/a,宽度的平均速度为20m/a,面积的平均速度为4000m2/a。应用了地质分析、水动力分析、极端海洋气候影响分析等新的理论和方法重点分析了海岸侵蚀的成因,并提出了一些对策,供相关部门参考。  相似文献   

秦皇岛港区春、夏和秋季底栖海藻的研究     

刘剑华  张耀红  杨毓英 《中国海洋大学学报(自然科学版)》1995,(1)

报道秦皇岛港区底栖海藻的群落结构、季节变化、生物量及优势种类等。通过４次定性采样指出：４月和６月的种类数高于８月和１０月，群落组成都以红藻类为优势。平均生物量分布以金山咀最高，灯塔最低，各采样点的优势种是新煤码头为绿藻类的孔石莼、肠浒苔和尾孢藻；灯塔为红藻类的珊瑚藻、鸭毛藻及绿藻类的孔石莼和刺松藻，金山咀为孔石莼、刺松藻、萱藻和蜈蚣藻。  相似文献   

山东省大中型水库浮游生物研究──Ⅰ．浮游动物生态     

卢敬让  李德尚  周春生 《中国海洋大学学报(自然科学版)》1994,(1)

报道１９８９～１９９０年山东省３０多个大中型代表水库浮游动物的种类组成，种类频级、优势类群。主要种和生物量；统计分析掠食性与植食性浮游动物生物量，浮游动物与浮游植物生物量及浮游动物与代表水库营养状态指标的总磷，透明度和深度的关系。提出浮游动物个体越小，其生物量与水库营养水平关系越密切。  相似文献   

Community and Population Responses of the Macroinfauna to Physical Factors over a Range of Exposed Sandy Beaches in South-central Chile     

Eduardo Jaramillo  Anton McLachlan 《Estuarine, Coastal and Shelf Science》1993,37(6)

Ten exposed sandy sites covering a range from reflective to dissipative beaches were sampled in south-central Chile to evaluate: (1) spatial changes in species richness, abundance and biomass of the intertidal macroinfauna in response to changes in mean grain size, beach face slope and beach type, and (2) spatial changes in abundance, biomass and body sizes of the most abundant species in response to changes in the physical factors. The number of species, abundance and biomass per beach in general decreased with increasing particle size and beach face slope (steeper beaches) and increased from reflective to dissipative conditions. The best fit for number of species was with Dean's parameter, a measure of beach type, whereas for abundance and biomass the best fits were found with particle size. The isopod Excirolana braziliensis and the anomuran Emerita analoga increased in abundance and biomass towards dissipative conditions, whereas Excirolana hirsuticauda showed the opposite trend in biomass and was significantly larger in beaches with steeper profiles. It is concluded that responses to changes in beach type are more pronounced at community level than within species populations.  相似文献   

Descriptive Analysis and Classification of Benthic Communities in Some Mediterranean Coastal Lagoons (Central Italy)   总被引：3，自引：0，他引：3  

M. F. Gravina  G. D. Ardizzone  F. Scaletta  C. Chimenz 《Marine Ecology》1989,10(2):141-166

Abstract. Benthic samples were taken seasonally at 32 stations in five coastal lagoons of Central Italy (Fogliano, Monaci, Caprolace, Fondi, and Lungo) during a two-year period (1982–1984). Composition and distribution of benthic populations in each lagoon as well as seasonal trends of species richness, density, diversity, and redundancy are presented and discussed.
The faunal differentiation appeared to be mainly due to the different degree of water exchange, both with marine and continental systems.  相似文献