气候变化领域集成服务门户(CCPortal): Enhancement of nutrient absorption and interspecific nitrogen transfer in a Eucalyptus urophylla × eucalyptus grandis and Dalbergia odorifera mixed plantation

CCPortal

DOI	10.1016/j.foreco.2019.117465
	Enhancement of nutrient absorption and interspecific nitrogen transfer in a Eucalyptus urophylla × eucalyptus grandis and Dalbergia odorifera mixed plantation
	Yao X.; Li Y.; Liao L.; Sun G.; Wang H.; Ye S.
发表日期	2019
ISSN	0378-1127
卷号	449
英文摘要	There is substantial evidence that legume-derived nitrogen (N) is transferred to neighboring nonlegumes in herbaceous mixtures and intercropping systems. However, considering that woody species are key sources and major consumers N, information regarding whether N transfer from leguminous to nonleguminous woody species in mixed plantations was detected. To detect N transfer in a Eucalyptus urophylla × Eucalyptus (E.) grandis and Dalbergia odorifera mixed system, two pot experiments were set up, one with 15N dilution and the other with 15N leaf labeling of Dalbergia odorifera. Seedlings were fertilized with CO (15NH2)2 urea, and the effects on interspecific N transfer and biological N fixation (BNF) efficiency were observed. Results showed that: (1) The values of competition ratio of Eucalyptus urophylla × E. grandis to Dalbergia odorifera (CRED) greater than one indicate that Eucalyptus urophylla × E. grandis was a stronger competitor and had the absolute advantage over Dalbergia odorifera, N application significantly increased the competition ratio of Eucalyptus urophylla × E. grandis to Dalbergia odorifera. An increase in the dry matter yields of Eucalyptus urophylla × E. grandis was observed in the NB treatment (20.36–33.16%), but the dry matter yields of Dalbergia odorifera decreased by 10.02–19.57%. (2) N was transferred from Dalbergia odorifera to Eucalyptus urophylla × E. grandis at rates of 9.60% and 6.50% in the 3 and 6 g pot−1 urea treatments with isotope dilution markers, respectively. N transfer rates of 13.66% and 7.88% were observed in the NB and MB treatments with 15N leaf labeling. (3) Interspecific root interaction increased N use efficiency and increased N2 fixation by Dalbergia odorifera; N fixation increased by 8.51% and 4.34% at the N1 and N2 levels under the NB treatment. The biomass and N use efficiency of Eucalyptus urophylla × E. grandis and Dalbergia odorifera has grown together were effectively improved compared to those of monocultures. The mechanism for our results may depend on interspecific N transfer, i.e., N transfer from Dalbergia odorifera to Eucalyptus urophylla × E. grandis, the stimulation of Dalbergia odorifera BNF and its increased use of atmospheric N sources may improve the exploitation of mixed plantations. © 2019 Elsevier B.V.
英文关键词	15N isotope dilution; 15N leaf labeling; Biological N fixation; N transfer; Root system separation
语种	英语
scopus关键词	Isotopes; Metabolism; Nitrogen; Plants (botany); Urea; Dalbergia odorifera; Eucalyptus grandis; Intercropping systems; Isotope dilutions; N-fixation; Nitrogen transfer; Nutrient absorption; Root system; Efficiency; absorption; biological method; biomass; dry matter; evergreen forest; experimental study; herb; intercropping; interspecific variation; legume; mixed forest; monoculture; nitrogen; nitrogen fixation; nutrient dynamics; nutrient use efficiency; root system; woody plant; Efficiency; Eucalyptus Grandis; Isotopes; Metabolism; Nitrogen; Urea; Dalbergia odorifera; Eucalyptus; Eucalyptus grandis; Eucalyptus urophylla
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155823
作者单位	College of Forestry, Guangxi University, Nanning, Guangxi Province 530004, China
推荐引用方式 GB/T 7714	Yao X.,Li Y.,Liao L.,等. Enhancement of nutrient absorption and interspecific nitrogen transfer in a Eucalyptus urophylla × eucalyptus grandis and Dalbergia odorifera mixed plantation[J],2019,449.
APA	Yao X.,Li Y.,Liao L.,Sun G.,Wang H.,&Ye S..(2019).Enhancement of nutrient absorption and interspecific nitrogen transfer in a Eucalyptus urophylla × eucalyptus grandis and Dalbergia odorifera mixed plantation.Forest Ecology and Management,449.
MLA	Yao X.,et al."Enhancement of nutrient absorption and interspecific nitrogen transfer in a Eucalyptus urophylla × eucalyptus grandis and Dalbergia odorifera mixed plantation".Forest Ecology and Management 449(2019).