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Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia
He, Xinxing; Chen, Yuanqi; Liu, Shengjie; Gunina, Anna; Wang, Xiaoli; Chen, Weili; Shao, Yuanhu; Shi, Leilei; Yao, Qing; Li, Jianxiong; Zou, Xiaoming; Schimel, Joshua P.; Zhang, Weixin; Fu, Shenglei
2018
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
Volume116Issue:xPages:351-359
AbstractEarthworms and arbuscular mycorrhizal fungi (AMF) interact to regulate plant nitrogen (N) supply, but the mechanisms through which they affect plant N uptake are unclear. We hypothesized that earthworms, plants and the associated AMF exhibit different preferences for different forms of inorganic N (NH4 and NO3-), which could regulate the effect of earthworms and AMF interaction on plant N acquisition. We outlined three independent but complementary experiments to test this hypothesis in the context of exotic earthworm, Pontoscolex corethrurus. The earthworm is dominating the plantation forests in subtropical and tropical regions of China, which have their understory dominated by the fern Dicranopteris dichotoma. By employing an excised root N-15 incubation experiment and a field in situ 15N experiment, we found that the fern prefers to use NH4 rather than NO3-. Then we did a 2 x 2 factorial microcosm experiment using AMF (Rhizophagus intraradices) and earthworms (P. corethrunis). The exotic earthworm increased soil NH4 concentration but did not affect soil NO3- concentration, while the AMF decreased soil NH4 concentration but had no effect on soil NO3- concentration. The increase in soil NH4 induced by the earthworms was efficiently utilized by the AMF, and significantly increased the total N uptake by the fern. In contrast, the AMF alone increased the N concentration of leaves and coarse roots, but not the total plant N uptake, primarily due to the lower levels of available NH4 compared with the earthworm treatments. The uninoculated fern did not benefit from the earthworm-induced increase in soil NH4, suggesting that the root of the fern cannot access the 'NH4 hotspots' created by the earthworms. Our work suggests that successful cooperation of earthworms and AMF on plant N uptake depends on the correct match in N-form.
Department其他
KeywordBiological Invasion Understory Plant n Availability Symbiosis Decomposer
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10710
Collection其他
Recommended Citation
GB/T 7714
He, Xinxing,Chen, Yuanqi,Liu, Shengjie,et al. Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,116(x):351-359.
APA He, Xinxing.,Chen, Yuanqi.,Liu, Shengjie.,Gunina, Anna.,Wang, Xiaoli.,...&Fu, Shenglei.(2018).Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia.SOIL BIOLOGY & BIOCHEMISTRY,116(x),351-359.
MLA He, Xinxing,et al."Cooperation of earthworm and arbuscular mycorrhizae enhanced plant N uptake by balancing absorption and supply of ammonia".SOIL BIOLOGY & BIOCHEMISTRY 116.x(2018):351-359.
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