Photosynthesis and nutrient-use efficiency in response to N and P addition in three dominant grassland species on the semiarid Loess Plateau

Chen, Z.F.; Xiong, Peifeng; Zhou, Junjie; Lai, Shuaibin; Jian, Chunxia; Wang, Z.; Xu, Bin

doi:10.32615/ps.2020.056

Cited by 10 publications

(10 citation statements)

References 40 publications

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“…Soils in the semiarid Loess Plateau are commonly deficient in both nitrogen (N) and phosphorus (P) [ 15 ]. Previous studies in the region have shown that appropriate N and P fertilization could improve soil N and P availability and play a positive role in increasing grassland productivity and recovery of degraded grasslands [ 16 , 17 , 18 ]. On the other hand, the effects of the N and P addition on photosynthetic and leaf functional traits of dominant species, which are important for understanding underlying mechanisms of grassland community dynamics under N and P inputs, have only received limited attention in the regional grassland.…”

Section: Introductionmentioning

confidence: 99%

Leaf Photosynthetic and Functional Traits of Grassland Dominant Species in Response to Nutrient Addition on the Chinese Loess Plateau

Jin

Lai

Chen

et al. 2022

Plants

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Leaf photosynthetic and functional traits of dominant species are important for understanding grassland community dynamics under imbalanced nitrogen (N) and phosphorus (P) inputs. Here, the effects of N (N0, N50, and N100, corresponding to 0, 50, and 100 kg ha−1 yr−1, respectively) or/and P additions (P0, P40, and P80, corresponding to 0, 40, and 80 kg ha–1 yr–1) on photosynthetic characteristics and leaf economic traits of three dominant species (two grasses: Bothriochloa ischaemum and Stipa bungeana; a leguminous subshrub: Lespedeza davurica) were investigated in a semiarid grassland community on the Loess Plateau of China. Results showed that, after a three-year N addition, all three species had higher specific leaf area (SLA), leaf chlorophyll content (SPAD value), maximum net photosynthetic rate (PNmax), and leaf instantaneous water use efficiency (WUE), while also having a lower leaf dry matter content (LDMC). The two grasses, B. ischaemum and S. bungeana, showed greater increases in PNmax and SLA than the subshrub L. davurica. P addition alone had no noticeable effect on the PNmax of the two grasses while it significantly increased the PNmax of L. davurica. There was an evident synergetic effect of the addition of N and P combined on photosynthetic traits and most leaf economic traits in the three species. All species had relatively high PNmax and SLA under the addition of N50 combined with P40. Overall, this study suggests that N and P addition shifted leaf economic traits towards a greater light harvesting ability and, thus, elevated photosynthesis in the three dominant species of a semiarid grassland community, and this was achieved by species–specific responses in leaf functional traits. These results may provide insights into grassland restoration and the assessment of community development in the context of atmospheric N deposition and intensive agricultural fertilization.

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Section: Introductionmentioning

confidence: 99%

Leaf Photosynthetic and Functional Traits of Grassland Dominant Species in Response to Nutrient Addition on the Chinese Loess Plateau

Jin

Lai

Chen

et al. 2022

Plants

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“…Nutrients addition could improve plant photosynthetic capacity by enlarging cell size and making the cell wall thinner to enhance stomatal conductance [ 56 ]. The variation of the net photosynthetic rate was inconsistent with that of stomatal conductance for some species, indicating that non-stomatal limitation (chlorophyll and carboxylation) may play an important role under N and P enrichment [ 28 , 57 , 58 ]. Overall, the different photosynthetic responses among the plant species in the alpine steppe suggested that long-term projected N and P addition may have the potential to change plant species composition and finally lead to the change of grassland community structure and function.…”

Section: Discussionmentioning

confidence: 99%

“…In the alpine grasslands, responses to nutrient limitation may differ among species, this may be associated with the contrasting carbon and nutrient economies of different forms [ 25 , 26 ], and interspecific eco-physiological adaptations disparity [ 27 , 28 ]. There are also studies demonstrated that plants of different functional types show different photosynthetic capacity when the availability of N and P changes [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, plant community shift could be predicted from individuals before ecosystem processes are largely influenced [ 30 ]. Eco-physiological responses of dominant species can reflect underlying mechanisms that lead changes in grassland community under N and P addition to some degree [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Some studies found that different species have different patterns of N and P allocation and nutrient economies [ 25 , 26 ]. Divergent adaptation mechanisms of among species may be due to their biological characteristics [ 28 ]. Based on this, we hypothesized that: (2) plant photosynthetic responses to N and P enrichment might be species-specific.…”

Section: Introductionmentioning

confidence: 99%

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Effects of N and P enrichment on plant photosynthetic traits in alpine steppe of the Qinghai-Tibetan Plateau

et al. 2022

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Background N (nitrogen) and P (phosphorus) play important roles in plant growth and fitness, and both are the most important limiting factors that affect grassland structure and function. However, we still know little about plant physiological responses to N and P enrichment in alpine grassland of the Qinghai-Tibetan Plateau. In our experiment, five dominant common herbaceous species were selected and their photosynthetic parameters, leaf N content, and aboveground biomass were measured. Results We found that species-specific responses to N and P enrichment were obvious at individual level. N addition (72 kg Nha−1 yr−1), P addition (36 kg Pha−1 yr−1) and NP addition (72 kg Nha−1 yr−1and 36 kg P ha−1 yr−1, simultaneously) significantly promoted net photosynthetic rate of Leymus secalinus. Differential responses also existed in the same functional groups. Responses of forb species to the nutrients addition varied, Aconitum carmichaeli was more sensitive to nutrients addition including N addition (72 kg Nha−1 yr−1), P addition (36 kg Pha−1 yr−1) and NP addition (72 kg Nha−1 yr−1and 36 kg P ha−1 yr−1). Responses of plant community photosynthetic traits were not so sensitive as those of plant individuals under N and P enrichment. Conclusions Our findings highlighted that photosynthetic responses of alpine plants to N and P enrichment were species-specific. Grass species Leymus secalinus had a higher competitive advantage compared with other species under nutrient enrichment. Additionally, soil pH variation and nutrients imbalance induced by N and P enrichment is the main cause that affect photosynthetic traits of plant in alpine steppe of the Qinghai-Tibetan Plateau.

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Effects of short‐term nitrogen addition on rhizosphere and bulk soil bacterial community structure of three halophytes in the Yellow River Delta

Zhang

Shao

et al. 2023

Land Degrad Dev

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The total amount and rate of atmospheric nitrogen (N) deposition are constantly increasing, which substantially influences the soil microbial community structure and function. However, it is still unclear whether the responses of different plant rhizosphere soil bacterial community to short‐term N addition was consistent. Based on 16s rRNA sequencing, we investigated the responses of rhizosphere and bulk soil bacterial community of halophytes (salt‐absorbing, salt‐rejecting, and salt‐secreting plant) to short‐term N addition in the Yellow River Delta. The bacterial community α‐diversity of Suaeda salsa (salt‐absorbing plant) was significantly higher in rhizosphere soil than in bulk soil, while no significant difference between Phragmites communis (salt‐rejecting plant) rhizosphere and bulk soil bacterial community α‐diversity was found. The differences were mainly ascribed to the higher N uptake capacity of P. communis, which resulted in no difference in N content between rhizosphere and bulk soil. The short‐term N addition significantly increased the α‐diversity of bacterial community in the rhizosphere soil of Aeluropus sinensis (salt‐secreting plant), but there was no effect on the α‐diversity of bacterial community in the rhizosphere soil of P. communis. Nitrogen addition enhances the salt uptake capacity of A. sinensis and alleviates the salt stress of bacterial growth. The relative abundance of Bacteroidetes for S. salsa and A. sinensis was significantly higher in rhizosphere soil than in bulk soil, and the relative abundance of Actinobacteria for P. communis and S. salsa was higher and lower in rhizosphere soil than in bulk soil, respectively. Salt‐absorbing of S. salsa leads to elevated rhizosphere soil salinity. Higher salinity and abundant carbon promote the Bacteroidetes and inhibit the Actinobacteria. Short‐term N addition caused an increase in the relative abundance of Gemmatimonadetes in halophyte rhizosphere soil and a decrease in the relative abundance of Firmicutes in S. salsa and A. sinensis bulk soil, which may be due to the different response of C:N of root secretions to N addition in halophytes. The relative abundance of rhizosphere soil denitrifying bacteria was higher in S. salsa and A. sinensis than in P. communis, while the reverse was observed for N‐fixing bacteria. The relative abundance of denitrifying bacteria decreased in P. communis and increased in S. salsa and A. sinensis. The low N soil environment of P. communis promotes the activity of N‐fixing bacteria, and the abundant N content of S. salsa and A. sinensis soil promotes the denitrification process. The research clarified that the response of soil bacterial community to short‐term N addition Treatment differed due to the influence of plant species and that N additions had smaller effects on the bacterial community than plant species.

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Photosynthesis and nutrient-use efficiency in response to N and P addition in three dominant grassland species on the semiarid Loess Plateau

Cited by 10 publications

References 40 publications

Leaf Photosynthetic and Functional Traits of Grassland Dominant Species in Response to Nutrient Addition on the Chinese Loess Plateau

Leaf Photosynthetic and Functional Traits of Grassland Dominant Species in Response to Nutrient Addition on the Chinese Loess Plateau

Effects of N and P enrichment on plant photosynthetic traits in alpine steppe of the Qinghai-Tibetan Plateau

Effects of short‐term nitrogen addition on rhizosphere and bulk soil bacterial community structure of three halophytes in the Yellow River Delta

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