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21.
木材初期腐朽研究综述 总被引:10,自引:0,他引:10
木材容易受到各种微生物的侵袭,真菌腐朽是导致木材破坏最严重的一种方式,即使是在木材质量损失率很小的腐朽初期,真菌也可以迅速引起木材结构的破坏,导致木材强度的急剧降低.生物培养和显微镜观察被认为是目前唯一权威的用来检测和评估木材初期腐朽的方法,但这些方法很难对木材的初期腐朽进行快速、准确地评估.因此,寻找一种迅速、准确地检测和评估木材初期腐朽的方法倍受人们的关注.有关初期腐朽及其检测与评估的研究在国外已有大量报道,而在我国却极为少见.本文综述了近几十年国内外有关木材初期腐朽及其检测与评估的研究,旨在增强人们对木材初期腐朽危害的认识,并呼吁有关部门重视相关研究在我国的发展. 相似文献
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本文讨论了节能式炉气干燥室设计的一些技术问题,如提高自生风引力增强通风;多种传热方式并用,增强传热,降低热损失的途径等,以达到节能降耗、快速干燥的目的。 相似文献
26.
森林昆虫和病原物的害与益 总被引:7,自引:1,他引:7
森林昆虫和病原物虽然能引起林木损伤与死亡,但它们在森林演替,物质循环和能量流动,食物来源,创造野生动物生境等方面都作了积极的贡献,而且在一个生态系统发展前景中,对于森林生物多样性,土壤肥力,森林的长时期健康和稳定性等方面,它们的促成作用也是必不可少的,因此,森林经营者应当考虑昆虫和病原物的害与益的两方面作用。 相似文献
27.
Socio-economic significance of reed forests in a rural community: A case study from the greater Sylhet Region of Bangladesh 总被引:1,自引:0,他引:1
Qumruzzaman Chowdhury A. Z. M. Manzoor Rashid Masuduzzaman Afrad 《Small-Scale Forestry》2004,3(1):121-130
The reed forests that are the subject of this study are scattered over five thanas of the Sunamganj and Sylhet Districts of
the Sylhet Division of Bangladesh. Their total area is 23,590 ha and they have great ecological, economic, commercial and
socio-economic importance due to the diversified resources they supply. However, the forests are commonly encroached on by
local people who are perceived to be seriously depleting the resource. This paper deals with the socio-economic status of
the people residing near these reed forests, and examines their dependency on the resources provided by the reed forests.
A socio-economic survey, participatory rural appraisal and interviews were used to obtain baseline data of the reed forest
resource and the local communities. The study reveals that the communities in the study region have higher income than other
areas of Bangladesh. Most survey respondents have other occupations in addition to farming. The literacy rate is 28.8%. Among
the illiterate, 68% engage in collecting reeds. Although the Forest Department has a management plan for sustainable use of
the reed forests, encroachers receive backing from political leaders and local elites, so their eviction is difficult. In
order to achieve long-term productivity and sustainability from the reed forests, this study recommends a strategy of developing
an integrated joint management plan between the Forest Department and the local people. 相似文献
28.
Bruchidius andrewesi Pic. has been recorded as a serious pest of pods and seeds of Acacia tortilis in the Thar desert of India. Pest infestation on developing pods and its relationship with morphological traits is reported. Pod infestation varied from 5 to 19% with 5–29% infestation of seeds. Infestation of pods is directly related to infestation of seed (r = 0.72**), and both pod and seed infestation are also directly correlated with loss in seed biomass (r = 0.79** and R = 0.88**). The infestation of pods starts in November and increases steady until harvest. Seeds kept in the laboratory for further studies were found to be 100% infested with B. andrewesi, as the insect multiplied faster under these conditions. The heavy infestation is damaging not only to A. tortilis but also to other leguminous trees of the desert. Bruchidius andrewesi has also been found on pods and seeds of Prosopis cineraria, an important indigenous tree of the region. 相似文献
29.
HUANG Yong-hong SHI Hui-mian ZHOU Xiao-yan XU Hong LUO Zhi-jun XU Fang-yun 《园艺学报》2015,31(7):1340-1344
Receptor type protein tyrosine phosphatase Q (PTPRQ) is an unusual protein tyrosine phosphatase that has intrinsic dephosphorylating activity for various phosphatidylinositiol and phospho-tyrosine substrates, especially the phosphatidylinositol activity. Recent data show that PTPRQ has an important role in various biological processes and is associated with some diseases. In this article, the structure and function of PTPRQ and the relationship between PTPRQ and diseases were briefly summarized. 相似文献
30.
An experiment to examine the effect of streptobacillary arthritis on mouse populations was conducted in maturing sorghum crops
in mouse-proofed pens. There were three treatment pens and three control pens in which mice with and without clinical signs
of streptobacillary arthritis were introduced, respectively. A constant mouse density (533 mice ha−1) was introduced to the pens by releasing 12 mice in each pen. The sex ratio of introduced mice was also constant by releasing
in each pen nine males and three females. Mean track index was lower in treatment pens than in control pens, indicating that
streptobacillary arthritis reduced the activity of mice. However, this was not translated into a reduction in other population
responses. Mean mouse density at harvest, percentage of female pregnant at harvest, yield loss caused by mice and a feeding
index (oil card index) did not differ significantly between treatment and control groups. A plausible explanation for these
findings was that mice with the clinical signs might be less active but were able to consume as much grains as mice without
the clinical signs because food was in abundant supply. 相似文献