全文获取类型
收费全文 | 1227篇 |
免费 | 47篇 |
国内免费 | 14篇 |
专业分类
林业 | 746篇 |
农学 | 16篇 |
基础科学 | 2篇 |
83篇 | |
综合类 | 379篇 |
农作物 | 1篇 |
畜牧兽医 | 8篇 |
园艺 | 10篇 |
植物保护 | 43篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 12篇 |
2021年 | 16篇 |
2020年 | 23篇 |
2019年 | 33篇 |
2018年 | 23篇 |
2017年 | 32篇 |
2016年 | 51篇 |
2015年 | 39篇 |
2014年 | 53篇 |
2013年 | 43篇 |
2012年 | 170篇 |
2011年 | 88篇 |
2010年 | 48篇 |
2009年 | 76篇 |
2008年 | 55篇 |
2007年 | 65篇 |
2006年 | 70篇 |
2005年 | 51篇 |
2004年 | 31篇 |
2003年 | 35篇 |
2002年 | 22篇 |
2001年 | 49篇 |
2000年 | 36篇 |
1999年 | 23篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 11篇 |
1995年 | 20篇 |
1994年 | 11篇 |
1993年 | 13篇 |
1992年 | 11篇 |
1991年 | 7篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 9篇 |
1987年 | 2篇 |
1955年 | 1篇 |
排序方式: 共有1288条查询结果,搜索用时 78 毫秒
91.
92.
通过对红松、刺楸人工混交林,红松纯林物种多样性的研究,结果表明,红松、刺楸混交林物种丰富度最大,植物种类最多,红松纯林仅为混交林的43%,总数量为混交林的32%,红松、刺楸混交林乔木层多样性指数为1.430 5,均匀度指数为0.687 9,优势度指数为0.290 6,丰富度指数为1.413 7,而红松纯林多样性指数、均匀度指数均为0,优势度指数为1,丰富度指数为0.371 2。在灌木层中,混交林与纯林各项指标区别不大,只有丰富度指数为混交林(纯林。在草本层中,混交林各项指数基本都大于纯林,只有均匀度指数红松纯林(混交林。 相似文献
93.
《Scandinavian Journal of Forest Research》2012,27(1-4):441-453
Cuttings were made from six‐year‐old seedlings of Picea abies L. (Karst.) that had been studied in the Stockholm phytotron. The seedlings belonged to four full‐sib families, one being of French origin, one of North‐Swedish origin and two being hybrids between parents of North‐Swedish and French origin. Nine clones from each family were included. After the rooting phase, the cuttings were exposed to the same cultivation regimes as the seedling ortets. Characteristics of growth rhythm, percentage free growth and leader length were recorded during the 2nd to the 5th growth period (GP). Plagiotropic growth habit was recorded in the 3rd to the 5th growth period, and, characteristics of the rooting phase were studied. A juvenile behaviour very similar to that characterizing growth periods 2–3 of the seedlings was observed for growth rhythm characteristics and for free growth capacity during GP2 of the cuttings. The absolute value of the differences between each observation of the seedling ortets in GP6 and the means of the cuttings in GP2 produced a new variable that quantified the degree of rejuvenation. This new variable was meaningfully calculated only for growth rhythm and growth pattern variables. A gradual reversion of the growth rhythm occurred for the cuttings, which corresponded to the change with increasing age for the seedlings. The capacity for free growth, on the contrary, disappeared already in GP3 for the cuttings, except for the French family. A large variation in the rejuvenation ability between families was observed. Furthermore, the rejuvenation ability was negatively correlated with the ability to grow plagiotropically. 相似文献
94.
95.
Effects of repeated urea doses on soil chemistry and nutrient pools in a Norway spruce stand 总被引:2,自引:0,他引:2
Hans-
rjan Nohrstedt Staffan Jacobson Ulf Sikstr m 《Forest Ecology and Management》2000,130(1-3):47-56
Pools of macro-nutrients in soil and vegetation were studied in an old fertilization experiment with a large previous input of N. Different doses of N, in the form of urea, had been added four times during a 20-year period. In total, between 480 and 2400 kg N ha−1 had been given. The experiment was established in a relatively productive Norway spruce stand and the expectation was that the large N input would cause an accelerated leaching of N, especially nitrate, accompanied by soil acidification and losses of several nutrients. The aim was to test for possible residual effects. Thirteen years after the last N addition, samples from the aboveground part of trees, field layer, S-layer, humus layer and mineral soil (0–10 cm) were analyzed for concentrations of most major nutrients. Nutrient pools were calculated. In the humus layer, the concentration of N increased and the C/N-ratio decreased with increasing N dose. The calculated recovery of added N in soil including ground vegetation was complete for the lowest N dose, while it was 25–50% for higher doses. The amount of N retained was unaffected by the N dose. The amount of extractable P in the upper part of the mineral soil was negatively correlated with N dose, as was also the concentration of total P in the S-layer. Neither soil pH, nor concentrations or amounts of Ca, Mg and K were affected by the previous fertilization. The calculated total soil-plant pool was only influenced by N dose in the case of P, which was 20% lower at the highest N dose compared with unfertilized conditions. Despite the large extra N input, the nutritional changes in plants and soil of the actual study site seemed surprisingly small. 相似文献
96.
97.
98.
周国荣 《中南林业调查规划》2007,26(3):62-64
通过对三江源自然保护区青海云杉在不同育苗密度下生长状况的试验调查,以及经济效益的分析,结果表明:3 a生原床苗在密度为600万株/hm2时生长状况最佳,密度为900万株/hm2时经济效益最佳;6 a生移植苗在密度为180万株/hm2时生长状况最佳,密度为240万株/hm2时经济效益最佳。 相似文献
99.
100.
青海云杉群落优势种群空间格局多样性研究 总被引:1,自引:0,他引:1
在青海云杉群落中用GPS定位设置样地16个、样方256个,研究甘肃祁连山林区青海云杉林优势种的空间分布格局。结果表明:青海云杉群落优势种的空间分布格局为集群分布;不同类型以及同一类型在不同的海拔高度的格局类型不尽相同,草类—青海云杉林逼近泊松分布,苔藓—青海云杉林有逼近泊松分布的趋势,混交林和其他类型为集群分布;不同类型优势种群的集群强度依次为:青海云杉混交林>灌木—青海云杉林>马先蒿—青海云杉林>苔藓—青海云杉林>草类—青海云杉林。苔藓—青海云杉林中优势种群在2 777~2 800 m为显著均匀分布,2 830~3 050 m为显著集群分布;草类—青海云杉林中优势种群在2 660~2 680 m为均匀分布,3 050~3 110 m为显著集群分布;混交林中青海云杉种群随海拔升高,集群强度增大,始终为显著集群分布;灌木—青海云杉林在低海拔(2 730 m)为均匀分布,在高海拔(2 880 m)为集群分布。青海云杉群落的进展演替过程依次为:青海云杉混交林、灌木—青海云杉林、草类—青海云杉林、马先蒿—青海云杉林、苔藓—青海云杉林。 相似文献