DIFFERENTIAL RESPONSES OF C-3 AND C-4 GRASSES TO MYCORRHIZAL SYMBIOSIS, PHOSPHORUS FERTILIZATION, AND SOIL-MICROORGANISMS
DIFFERENTIAL RESPONSES OF C-3 AND C-4 GRASSES TO MYCORRHIZAL SYMBIOSIS, PHOSPHORUS FERTILIZATION, AND SOIL-MICROORGANISMS
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DOI：
10.1139/b90-061
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发表时间：
1990-03-01
期刊：
影响因子：
--
通讯作者：
TODD, TC
中科院分区：
文献类型：
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作者：
HETRICK, BAD;WILSON, GWT;TODD, TC
在温室研究中比较了五种 C4 暖季高草草原草和五种 C3 冷季高草草原草对磷 (P) 施肥、菌根和土壤微生物的反应。暖季草对菌根或施磷肥有积极反应，但菌根植物对磷肥没有反应。土壤微生物区系减少了菌根植物干重和根定殖。相比之下，冷季型草对菌根或施磷肥没有反应。土壤微生物不会抑制冷季植物的生长，但在非无菌土壤中根部定植会减少。对于暖季型草来说，菌根定殖与磷肥之间存在负相关关系，而根定殖与植物干重之间存在正相关关系。对于冷季型草类，根部定植与磷肥之间也存在反比关系，但根部定殖与植物干重之间呈负相关。在暖季型和冷季型草中，即使施磷足以消除菌根对植物生长的影响，菌根根部定植的水平仍然较低。因此，暖季型和冷季型草在养分获取方面表现出截然不同的策略。
The responses of five C4, warm-season and five C3, cool-season tallgrass prairie grasses to phosphorus (P) fertilization, mycorrhizae, and soil microorganisms were compared in greenhouse studies. The warm-season grasses responded positively to mycorrhizae or to P fertilization, but mycorrhizal plants did not respond to P. The soil microflora reduced mycorrhizal plant dry weight and root colonization. In contrast, cool-season grasses did not respond to mycorrhizae or P fertilization. Soil microorganisms did not suppress cool-season plant growth, but root colonization was reduced in nonsterile soil. For the warm-season grasses there was an inverse relationship between mycorrhizal root colonization and P fertilization and a positive relationship between root colonization and plant dry weight. For the cool-season grasses there was also an inverse relationship between root colonization and P fertilization, but the relationship between root colonization and plant dry weight was negative. In both the warm-season and cool-season grasses, low levels of mycorrhizal root colonization persisted even when P fertilization was sufficient to eliminate mycorrhizal effects on plant growth. Thus, warm- and cool-season grasses display profoundly different strategies for nutrient acquisition.