全文获取类型
收费全文 | 545篇 |
免费 | 4篇 |
国内免费 | 55篇 |
出版年
2023年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 16篇 |
2012年 | 8篇 |
2011年 | 6篇 |
2010年 | 7篇 |
2009年 | 23篇 |
2008年 | 20篇 |
2007年 | 21篇 |
2006年 | 31篇 |
2005年 | 32篇 |
2004年 | 29篇 |
2003年 | 25篇 |
2002年 | 13篇 |
2001年 | 22篇 |
2000年 | 18篇 |
1999年 | 28篇 |
1998年 | 29篇 |
1997年 | 13篇 |
1996年 | 19篇 |
1995年 | 27篇 |
1994年 | 17篇 |
1993年 | 24篇 |
1992年 | 16篇 |
1991年 | 20篇 |
1990年 | 17篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 16篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1976年 | 3篇 |
排序方式: 共有604条查询结果,搜索用时 156 毫秒
491.
Growth and nutrient status of citrus plants as influenced by mycorrhiza and phosphorus application 总被引:1,自引:0,他引:1
To test the hypothesis that high levels of soluble phosphate applied in combination with VAM fungi, to citrus plants, can
cause growth depression even in the absence of other limiting factors, and also to test if rock phosphate, under these conditions,
may be a satisfactory P source, a greenhouse experiment was conducted using sterilized soil with four levels of phosphate
(0, 50, 100 and 200 ppm P) supplied either as soluble P or as rock phosphate. Citrus seedlings were either inoculated with
the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus etunicatum or left uninoculated. Six months after the start of the experiment, the plants were harvested and shoot dry weight, P and
K uptake, root colonization and the number of spores in 50 cm3 of soil were determined. Significant increases were found in dry matter yields and in P and K contents, due to VAM fungus
inoculation, at the zero and 50 ppm soluble P levels and at all rock phosphate levels. At 100 ppm soluble P, the development
of VAM plants was equilvalent to that of non-VAM plants, and at 200 ppm, growth was significantly less than that of non-VAM
plants. Root colonization and sporulation were reduced at higher P levels. The absolute growth depression of VAM plants at
the higher P level was likely due to P toxicity. In addition, high leaf P and K concentrations may have interfered with carbohydrate
distribution and utilization in these symbioses. Rock phosphate may be used with VAM citrus to substitute for medium amounts
of soluble phosphate. 相似文献
492.
The effect of mycorrhizal inoculation on 15N transfer from soybean to maize was studied in fumigated and non-fumigated soil. Three Glomus species and a non-inoculated control were compared.In spite of higher levels of root colonization and more abundant hyphae associated with plants growing in fumigated soil, mycorrhizae-enhanced 15N transfer to maize was significant only in non-fumigated plots. High 15N transfer was not only associated with high mycelium density in soil but also with low soil microbial carbon, suggesting that the effect of mycorrhizal fungi on soil microbial populations may be an important factor affecting N transfer between mycorrhizal plants. 相似文献
493.
This paper reports twoGlomus spp. isolated from rhizosphere soil in a bentgrass nursery of a golf course in Hyogo Prefecture, western Japan. One was identified
asG. etunicatum, new to Japan, while the other remained unidentified because of lack of information. 相似文献
494.
Robert C. Ebel Gregory E. Welbaum Mali Gunatilaka Tammy Nelson R. M. Augé 《Mycorrhiza》1996,6(2):119-127
We examined the influence of Glomus intraradices on nonhydraulic signaling of soil drying, in a drought-avoiding plant having stomates that are extremely sensitive to changes
in soil moisture. Cowpea [Vigna un
guiculata (L.) Walp. 'White Acre'] seedlings were grown in a greenhouse with root systems split between two pots. The 2×3×2 experimental
design included two levels of mycorrhizal colonization (presence or absence of Glomus intraradices Schenck & Smith UT143), three levels of phosphorus fertilization within each mycorrhizal treatment and two levels of water
(both pots watered or one pot watered, one pot allowed to dry). Stomatal conductance was mostly similar in fully watered mycorrhizal
and nonmycorrhizal controls. However, g
s
of half-dried, nonmycorrhizal plants was reduced on fewer days and to a lesser extent than g
s
of half-dried, mycorrhizal plants, perhaps related to quicker soil drying in mycorrhizal pots. The partial soil drying treatment
had little effect on leaf relative water content or osmotic potential, indicating that declines in g
s
and leaf growth were induced by some nonhydraulic factor. Leaf growth was inhibited only in nonmycorrhizal plants, evidently
due to a difference in phosphorus nutrition between mycorrhizal and nonmycorrhizal plants. The mycorrhizal effect on g
s
was not associated with phosphorus nutrition. Inhibition of g
s
was directly related to extent of soil drying, while inhibition of leaf growth was inversely related to extent of soil drying.
Accepted: 4 August 1995 相似文献
495.
蕨类植物的VA菌根及其协同进化的初步研究 总被引:1,自引:0,他引:1
蕨类植物的VA菌根及其协同进化的初步研究赵之伟张涛和兆荣(云南大学生物系,昆明650091)(云南大学生态地植物研究所,昆明650091)StudiesonVAMycorrhizalStateofPteridophytesandTheirCoevo... 相似文献
496.
A field trial was conducted to study the response of sunflower (Helianthus annuus L.) to different phosphorus levels (16, 24 or 32 kg P ha–1) and inoculation with vesicular-arbuscular mycorrhizal fungus, Glomus fasciculatum on vertisol during summer 1993. At the vegetative stage of sunflower, percent mycorrhizal root colonization, spore count, dry biomass and P uptake did not differ significantly between inoculated and uninoculated control plants. However, at later stages (flowering and maturity) percent root colonization, spore count, total dry biomass and total P uptake were significantly higher in inoculated plants than in uninoculated control plants. The total dry biomass, P content and seed yield increased with increasing P level in uninoculated plants, whereas no significant difference was observed between 16 and 32 kg P ha–1 in inoculated plants. The positive effect of mycorrhizal inoculation decreased with increasing P level above 16 kg P ha–1, due to decreased percent root colonization and spore count at higher P levels. 相似文献
497.
There have been some scientific reports suggesting that dual inoculations with arbuscular mycorrhizal (AM) and saprophytic soil fungi may cause an additive or synergistic growth enhancement of the inoculated host plant. Some Trichoderma spp. have shown antagonistic potential against pathogenic fungi and a beneficial effect on plant growth. Joint inoculations of the mycorrhizal fungus Glomus intraradices Schenck and Smith, isolated from a citrus nursery (Tarragona, Spain) and a strain of Trichoderma aureoviride Rifai, isolated from an organic compost, were tested on a citrus rootstock, Citrus reshni Hort. ex Tan. The interactions between both microorganisms and their influence on mycorrhizal root colonization and plant growth enhancement, the changes produced in the soil microbial activity, like esterase, trehalase, phosphatase and chitinase activities, and on microbial populations were evaluated in three organic substrates: (1) sphagnum peat and autoclaved sandy soil (1/1, v/v), (2) sphagnum peat, quartz sand and perlite (1/1/1, v/v) and (3) pine bark compost (BVU, Prodeasa Product). Substrate characteristics were more important than the AM inoculation treatment in the determination of enzyme activity. In bark compost, the number of bacterial colonies obtained on soil-dilution plates was significantly higher than in peat and sand mixtures. Inoculation with T. aureoviride alone produced no significant effect on growth enhancement of C. reshni. However, dual inoculation with both, T. aureoviride and G. intraradices significantly increased plant growth in two of the substrates used and was the best treatment in pine bark amended compost. The inoculation with T. aureoviride did not affect the development of mycorrhizal root colonization. These results show a synergistic effect of G. intraradices and T. aureoviride on the growth of C. reshni in organic substrates and indicate the potential benefits of using combined inoculations. 相似文献
498.
In a pot experiment, wheat was grown for 50 days in two heat-sterilized low-phosphorus (P) soils supplied with organic P as Na-phytate. Seed inoculation with the phosphatase-producing fungus (PPF) Aspergillus fumigatus or soil inoculation with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae increased shoot and root dry weight and root length, phosphatase activity in the rhizosphere and shoot concentrations of P and to a lesser extent of K and Mg. As a rule, the greatest effects on those parameters were most in the combined inoculation treatment (PPF + VAM). Shoot concentrations of Cu and Zn were only enhanced by VAM, not by PPF. At harvest, depletion of organic P in the rhizosphere soil increased in the order of: sterilized soil < PPF < VAM < PPF + VAM which corresponded with the enhanced P concentrations in the plants. The results demonstrate that organic P in form of Na-Phytate is efficiently used by VAM and that use of organic P can be increased by simultaneous inoculation with phosphatase-producing fungi. 相似文献
499.
The growth responses of lentil (Lens esculenta L. cv. Laird) and two wheat cultivars (Triticum aestivum L. cv. Laura and Neepawa) to Glomus clarum NT4 in soil containing indigenous arbuscular mycorrhizal fungi (AMF) and fertilized with phosphorus at different (0, 5, 10,
20 ppm) levels was studied in a growth chamber. Soil was inoculated with a monospecific culture of G. clarum NT4 to provide an inoculant:indigenous AMF ratio of ca. 1 : 100. The shoot and root growth, and AMF colonization levels of
NT4-inoculated lentil were significantly (P≤0.05) greater than the appropriate control plants in the unfertilized soil at 48 days after planting (DAP). At 95 DAP, NT4
inoculation had significantly increased the shoot dry weight (P≤0.08) and AMF colonization (P≤0.05) of lentil plants receiving 5 mg P kg–1 soil, whereas 20 mg P kg–1 soil reduced the shoot growth of NT4-inoculated plants. The NT4 inoculant had no effect (P≤0.05) on shoot P content, but increased (P≤0.08) the P-use efficiency of lentil plants receiving 5 mg P kg–1 soil. In contrast to the inoculant's effect on lentil, NT4 generally had no positive effect on any of the parameters assessed
for wheat cv. Laura at any P level at 48 or 95 DAP. Similarly, there was no positive effect of NT4 on shoot or root growth,
or AMF colonization of wheat cv. Neepawa plants at any P level at 48 DAP. However, NT4 inoculation increased the grain yield
of Neepawa by 20% (P≤0.05) when fertilized with 20 mg P kg–1 soil. This yield increase was associated with a significant (P≤0.05) reduction in root biomass and a significant (P≤0.05) increase in the grain P content of inoculated plants. Thus, NT4 appears to have a preference for the Neepawa cultivar.
Our results show that lentil was more dependent on mycorrhizae than wheat and responded to an AMF inoculant even in soil containing
high levels of indigenous AMF. It might, therefore, be possible to develop mixed inoculants containing rhizobia and AMF for
field production of legumes.
Accepted: 22 February 1997 相似文献
500.
Ahmad M. Al-Raddad 《Mycorrhiza》1995,5(3):229-231
Five crops inoculated with Glomus mosseae were grown for 10 weeks and the development of mycorrhizal infection and sporulation were assessed. Infected roots from pot cultures of different ages were used to examine the host effect on the development of mycorrhizae. The effectiveness of each host was assessed by measuring spore numbers. For all hosts, the percentage of root length infected increased rapidly up to 10 weeks after sowing. Infectivity of root inocula increased with increasing percentage of root length infected with the inoculum for all crops, except where large numbers of mature spores (1755) had been produced on barley. The highest spore numbers were achieved in the rhizosphere of barley plants, followed by chickpea and beans. The lowest spore numbers were found in the rhizosphere of corn and okra plants. The type of the crop as well as the harvest date greatly influenced the size of the spore population and the extent of root colonization of G. mosseae. 相似文献