干旱区生态环境知识资源中心(Arid): Effects of nitrogen addition and Bothriochloa ischaemum and Lespedeza davurica mixture on plant chlorophyll fluorescence and community production in semi-arid grassland

Arid

DOI	10.3389/fpls.2024.1400309
	Effects of nitrogen addition and Bothriochloa ischaemum and Lespedeza davurica mixture on plant chlorophyll fluorescence and community production in semi-arid grassland
	Wang, Fugang; Shi, Lei; Zhang, Ruiyi; Xu, Weizhou; Bo, Yaojun
通讯作者	Xu, WZ
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2024
卷号	15
英文摘要	Background Grass-legume mixture can effectively improve productivity and stimulate overyielding in artificial grasslands, but may be N-limited in semi-arid regions. This study investigated the effects of N addition on chlorophyll fluorescence and production in the grass-legume mixtures community. Methods An N addition experiment was conducted in the Bothriochloa ischaemum and Lespedeza davurica mixture community, with seven mixture ratios (B0L10, B2L8, B4L6, B5L5, B6L4, B8L2, and B10L0) according to the sowing abundance of B.ischaemum and L.davurica and four N addition levels, N0, N25, N50, and N75 (0,25,50,75kgNhm(-2) a(-1)), respectively. We analyzed the response of chlorophyll fluorescence parameters of the two species, the rapid light-response curves of chlorophyll fluorescence, as well as aboveground biomass (AGB) and overyielding. Results Our results showed that the two species showed different photosynthetic strategies, with L.davurica having significantly higher initial fluorescence (Fo), effective photochemical quantum yield of PSII (Phi PSII), and coefficient of photochemical fluorescence quenching (qP) than B. ischaemum, consisting with results of rapid light-response curves. N addition and mixture ratio both had significant effects on chlorophyll fluorescence and AGB (p<0.001). The Phi PSII and qP of L.davurica were significantly lowest in B5L5 and B6L4 under N addition, and the effect of N varied with mixture ratio. The photosynthetic efficiency of B. ischaemum was higher in mixture than in monoculture (B10L0), and Phi PSII was significantly higher in N50 than in N25 and N50 at mixture communities except at B5L5. The community AGB was significantly higher in mixture communities than in two monocultures and highest at B6L4. In the same mixture ratio, the AGB was highest under the N50. The overyielding effects were significantly highest under the N75 and B6L4 treatments, mainly attributed to L.davurica. The partial least squares path models demonstrated that adding N increased soil nutrient content, and complementary utilization by B.ischaemum and L.davurica increased the photosynthetic efficiency. However, as the different photosynthetic strategies of these two species, the effect on AGB was offset, and the mixture ratio's effects were larger than N. Our results proposed the B6L4 and N50 treatments were the optimal combination, with the highest AGB and overyielding, moderate grass-legume ratio, optimal community structure, and forage values.
英文关键词	grass-legume mixture nitrogen addition chlorophyll fluorescence aboveground biomass overyielding
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001264620900001
WOS关键词	LEAF GAS-EXCHANGE ; SPECIES-DIVERSITY ; LEGUME MIXTURES ; LOESS PLATEAU ; YIELD ; FIXATION ; LIGHT
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403882
推荐引用方式 GB/T 7714	Wang, Fugang,Shi, Lei,Zhang, Ruiyi,et al. Effects of nitrogen addition and Bothriochloa ischaemum and Lespedeza davurica mixture on plant chlorophyll fluorescence and community production in semi-arid grassland[J],2024,15.
APA	Wang, Fugang,Shi, Lei,Zhang, Ruiyi,Xu, Weizhou,&Bo, Yaojun.(2024).Effects of nitrogen addition and Bothriochloa ischaemum and Lespedeza davurica mixture on plant chlorophyll fluorescence and community production in semi-arid grassland.FRONTIERS IN PLANT SCIENCE,15.
MLA	Wang, Fugang,et al."Effects of nitrogen addition and Bothriochloa ischaemum and Lespedeza davurica mixture on plant chlorophyll fluorescence and community production in semi-arid grassland".FRONTIERS IN PLANT SCIENCE 15(2024).