全文获取类型
收费全文 | 381篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 4篇 |
环保管理 | 9篇 |
综合类 | 202篇 |
基础理论 | 63篇 |
污染及防治 | 86篇 |
评价与监测 | 10篇 |
社会与环境 | 8篇 |
出版年
2021年 | 3篇 |
2018年 | 4篇 |
2016年 | 5篇 |
2014年 | 8篇 |
2013年 | 12篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 10篇 |
2009年 | 16篇 |
2008年 | 7篇 |
2007年 | 21篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2004年 | 9篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 9篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1983年 | 3篇 |
1981年 | 4篇 |
1978年 | 3篇 |
1967年 | 4篇 |
1966年 | 4篇 |
1965年 | 5篇 |
1964年 | 8篇 |
1963年 | 11篇 |
1962年 | 4篇 |
1961年 | 7篇 |
1960年 | 5篇 |
1959年 | 6篇 |
1958年 | 10篇 |
1957年 | 7篇 |
1956年 | 7篇 |
1955年 | 12篇 |
1954年 | 6篇 |
1952年 | 4篇 |
1951年 | 3篇 |
1950年 | 6篇 |
1947年 | 5篇 |
1943年 | 6篇 |
1939年 | 4篇 |
1928年 | 2篇 |
1924年 | 3篇 |
排序方式: 共有384条查询结果,搜索用时 46 毫秒
11.
Neither the “Green Revolution” in the developing countries nor “yield explosion” in the agricultural production of the industrialized nations have reached the genetic and physiologic limits of crop growth. Breeding of better varieties is still the most promising defense against hunger. The ambiguity of modern agroindustry throughout the world resides in its high dependence on the existence of functional technological, economical, and political systems.
相似文献12.
13.
14.
15.
16.
17.
18.
19.
Germán A. Kopprio Gerhard Kattner R. Hugo Freije Susana José de Paggi Rubén J. Lara 《Environmental monitoring and assessment》2014,186(5):3139-3148
The seasonal variability of inorganic and organic nutrients and stable isotopes and their relations with plankton and environmental conditions were monitored in Lake Chasicó. Principal component analysis evidenced the strong influence of the river runoff on several biogeochemical variables. Silicate concentrations were controlled by diatom biomass and river discharge. Higher values of nitrate and soluble reactive phosphorus (SRP) indicated agricultural uses in the river basin. Elevated pH values (~9) inhibiting nitrification in the lake explained partially the dominance of ammonium: ~83 % of dissolved inorganic nitrogen (DIN). The low DIN/SRP ratio inferred nitrogen limitation, although the hypotheses of iron and CO2 limitation are relevant in alkaline lakes. Particulate organic matter (POM) and dissolved organic matter (DOM) were mainly of autochthonous origin. The main allochthonous input was imported by the river as POM owning to the arid conditions. Dissolved organic carbon was likely top-down regulated by the bacterioplankton grazer Brachionus plicatilis. The δ13C signature was a good indicator of primary production and its values were influenced probably by CO2 limitation. The δ15N did not evidence nitrogen fixation and suggested the effects of anthropogenic activities. The preservation of a good water quality in the lake is crucial for resource management. 相似文献
20.
Innovative aspects of environmental chemistry and technology regarding air,water, and soil pollution
Katsoyiannis Ioannis A. Lammel Gerhard Samara Constantini Ernst Mathias Wenk Jannis Torretta Vincenzo Voutsa Dimitra Vollertsen Jes Bucheli Thomas D. Godbersen Levke Lambropoulou Dimitra Heath Ester Kallenborn Roland Giannakoudakis Dimitrios Deliyanni Eleni Bandosz Teresa J. Ražić Slavica Samanidou Viktoria Papa Ester Lacorte Silvia Katsoyiannis Athanasios 《Environmental science and pollution research international》2021,28(42):58958-58968
Environmental Science and Pollution Research - 相似文献