2000年度气象条件对农作物生长的影响   总被引：1，自引：0，他引：1  

张雪芬  刘荣花等 《河南气象》2001,(3):32-33

1　对小麦生产的影响1.1　播期雨水多有利播种 ,苗期光热足有利生长2 0 0 0年度麦播期 10月份 ,全省降水 5 7～ 15 4ｍｍ ,比上年同期偏多 5 0～ 12 9ｍｍ ,比常年同期偏多 10～ 79ｍｍ。全省大部分地市小麦能足墒下种 ,麦播基础是近几年较好的一年 ,但部分地市由于降水偏多 ,小麦播期比常年推迟 3～ 8天 ,加之气温一直偏低 ,部分土壤湿度过大的田块小麦出苗缓慢。小麦苗期 ,全省降水量明显偏少 ,大部分地市降水量在15ｍｍ以下 ,部分地市土壤表层旱象开始露头 ,但由于前期降水较多 ,土壤底墒较好 ,对小麦长势影响不大。小麦苗期 (1999年 11…  相似文献   

玻利维亚一个巨大的斑岩银矿波托西省里科山矿床     

Sutt.  KR  张新安 《国土资源信息化》1989,(2):21-22

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巴西的金山—Morro DE Ouro由于无需剥离,品位一致...     

Sutt.  KR 杨玉波 《世界地质》1992,11(4):114-117

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美国威斯康星州中部地下水的年龄指示物—氚     

Brad.  KR 王伟礼 《水文地质工程地质译丛》1993,(2):15-23

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Is one an upper limit for natural hydraulic gradients?     

Hart DJ  Bradbury KR  Gotkowitz MB 《Ground water》2008,46(4):518-520

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Assessing background ground water chemistry beneath a new unsewered subdivision     

Wilcox JD  Bradbury KR  Thomas CL  Bahr JM 《Ground water》2005,43(6):787-795

Previous site-specific studies designed to assess the impacts of unsewered subdivisions on ground water quality have relied on upgradient monitoring wells or very limited background data to characterize conditions prior to development. In this study, an extensive monitoring program was designed to document ground water conditions prior to construction of a rural subdivision in south-central Wisconsin. Previous agricultural land use has impacted ground water quality; concentrations of chloride, nitrate-nitrogen, and atrazine ranged from below the level of detection to 296 mg/L, 36 mg/L, and 0.8 microg/L, respectively, and were highly variable from well to well and through time. Seasonal variations in recharge, surface topography, aquifer heterogeneities, surficial loading patterns, and well casing depth explain observed variations in ground water chemistry. This variability would not have been detected if background conditions were determined from only a few monitoring wells or inferred from wells located upgradient of the subdivision site. This project demonstrates the importance of characterizing both ground water quality and chemical variability prior to land-use change to detect any changes once homes are constructed.  相似文献   

Natural turbidity variability and weather forecasts in risk management of anthropogenic sediment discharge near sensitive environments     

Orpin AR  Ridd PV  Thomas S  Anthony KR  Marshall P  Oliver J 《Marine pollution bulletin》2004,49(7-8):602-612

Coastal development activities can cause local increases in turbidity and sedimentation. This study characterises the spatial and temporal variability of turbidity near an inshore fringing coral reef in the central Great Barrier Reef, under a wide range of natural conditions. Based on the observed natural variability, we outline a risk management scheme to minimise the impact of construction-related turbidity increases. Comparison of control and impact sites proved unusable for real-time management of turbidity risks. Instead, we suggest using one standard deviation from ambient conditions as a possible conservative upper limit of an acceptable projected increase in turbidity. In addition, the use of regional weather forecast as a proxy for natural turbidity is assessed. This approach is simple and cheap but also has limitations in very rough conditions, when an anthropogenic turbidity increase could prove fatal to corals that are already stressed under natural conditions.  相似文献   

Results from a sixteen year study on the effects of oiling from the Exxon Valdez on adult pink salmon returns     

Brannon EL  Maki AW  Moulton LL  Parker KR 《Marine pollution bulletin》2006,52(8):892-899

For sixteen years following the 1989 Exxon Valdez oil spill adult returns of pink salmon in Prince William Sound, Alaska were monitored to assess spill effects on survival. No evidence of spill effects was detected for either intertidal or whole-stream spawning fish. From 1989 through 2004 mean densities for oiled and reference streams tracked each other, illustrating similar responses of oiled and reference stream adult populations to naturally changing oceanographic and climactic conditions. Hatchery fish strayed into the study streams, but similar incursions occurred in oiled and reference streams, and their presence was compensated for to eliminate their influence on determining the success of the returning natural populations. These results, showing no detectable effects of oiling on pink salmon spawning populations, are supported by published field studies on pink salmon incubation success in oiled streams.  相似文献