Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (6): 501-511.doi: 10.17521/cjpe.2019.0041

• Research Articles • Previous Articles     Next Articles

Effects of water and nutrient additions on functional traits and aboveground biomass of Leymus chinensis

ZHAO Dan-Dan1,2,MA Hong-Yuan1,*(),LI Yang1,2,WEI Ji-Ping1,WANG Zhi-Chun1   

  1. 1 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
    2 University of Chinese Academy of Science, Beijing 100049, China
  • Received:2019-02-25 Revised:2019-06-10 Online:2019-09-30 Published:2019-06-20
  • Contact: MA Hong-Yuan E-mail:mahongyuan@iga.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(41771058);the National Key R&D Program of China(2016YFC0501200);the National Basic Research Program of China(2015CB150802);the National Key Basic Survey of Resources(2015FY110500);the Category A Strategic Leading Science and Technology Project of Chinese Academy of Sciences(XDA2306040303)

Abstract:

Aims The research on the response of plant functional traits to environmental change, such as precipitation change and nutrient additions is very important to understand how plant species adapt to variable environments. Methods We conducted a pot experiment with a gradient of water treatments (increase precipitation by 50%, HW; decrease precipitation by 50%, LW; take 498 mm precipitation as control, MW) and nutrient additions (without nutrient addition, CK; nitrogen (N) addition, NA; phosphorus (P) addition, PA; nitrogen and phosphorus additions, N+P). We investigated 11 plant functional traits and aboveground biomass of Leymus chinensis. Important findings The effects of moisture on plant height, tillers, stem biomass, leaf biomass, leaf area, leaf mass, net photosynthetic rate, transpiration rate, water use efficiency were significant. The effects of fertilizers on tillers, stem biomass, net photosynthetic rate, transpiration rate, water use efficiency were significant. And the combination of fertilizers and moisture had a significant influence on tillers, stem biomass, transpiration rate and water use efficiency (two-way ANOVA). The pattern of functional traits in response to precipitation differed between plants with varied fertilizer additions. Tillers and leaf area were increased in treatments with HW under N and N+P additions, but not changed under CK and P addition. Stem biomass increased along the precipitation gradients under CK, N addition and P addition, but did not change under N+P additions. Specific leaf area with HW was significantly higher than that of MW under N addition, but not changed under other nutrient addition. Short-term nutrient additions significantly affected photosynthetic physiological traits of L. chinensis, but it had no significant effect on morphological traits under the same precipitation. The aboveground biomass of L. chinensis increased with the increase of precipitation, and reached the highest level of 522.55 g·m -2 with HW treatment under N addition. In conclusion, our results indicate that the functional traits in L. chinensis respond to precipitation addition and the patterns of responses differ under different nutrient additions, reflecting the adaptation to changes in water and nutrient availability.

Key words: plant functional traits, morphological traits, physiological traits, aboveground biomass

Table 1

Results of two-way ANOVAs for the effects of water treatments, fertilization treatment and their interactions on functional traits of Leymus chinensis"

因素 Factor d.f. H T SB LB
F p F p F p F p
生长特性
Growth
feature
水分 Water (W) 2 27.819 <0.001 18.582 <0.001 23.314 <0.001 25.679 <0.001
施肥 Fertilization (F) 3 2.307 ns 3.436 <0.05 3.600 <0.05 2.533 ns
水肥交互 W × F 6 1.796 ns 2.925 <0.05 5.637 <0.01 2.372 ns
LA LM SLA
F p F p F p
形态性状
Morphological
trait
水分 W 2 10.384 <0.01 6.842 <0.01 0.846 ns
施肥 F 3 1.416 ns 1.422 ns 2.991 ns
水肥交互 W × F 6 0.610 ns 1.424 ns 1.528 ns
Pn Tr WUE
F p F p F p
生理性状
Physiological
trait
水分 W 2 115.990 <0.001 86.229 <0.001 105.150 <0.001
施肥 F 3 6.948 <0.001 5.325 <0.01 3.972 <0.05
水肥交互 W × F 6 1.750 ns 5.608 <0.001 4.828 <0.001

Fig. 1

Effects of fertilization and water on height and tillers of Leymus chinensis (mean ± SE). CK, control; NA, N addition; PA, P addition; N+P, N and P additions; LW, MW, HW represent low, moderate and high precipitation levels. Different lowercase letters indicate significant difference (p < 0.05) among different water treatments at the same fertilizer addition, and ns indicates non-significant differences (p > 0.05) among water treatments."

Fig. 2

Effects of fertilization and water on biomass allocation of Leymus chinensis (mean ± SE). CK, control; NA, N addition; PA, P addition; N+P, N and P additions; LW, MW, HW represent low, moderate and high precipitation levels. Different lowercase letters indicate significant difference (p < 0.05) among different water treatments at the same fertilizer addition, and ns indicates non-significant differences (p > 0.05) among water treatments."

Fig. 3

Effects of fertilization and water on morphological traits of Leymus chinensis (mean ± SE). LA, leaf area; SLA, specific leaf area. CK, control; NA, N addition; PA, P addition; N+P, N and P additions; LW, MW, HW represent low, moderate and high precipitation levels. Different lowercase letters indicate significant difference (p < 0.05) among different water treatments at the same fertilizer addition, and ns indicates non-significant differences (p > 0.05) among water treatments."

Fig. 4

Effects of fertilization and water on photosynthetic traits of Leymus chinensis (mean ± SE). Pn, net photosynthesis rate; WUE, water use efficiency. CK, control; NA, N addition; PA, P addition; N+P, N and P additions; LW, MW, HW represent low, moderate and high precipitation levels. Different lowercase letters indicate significant difference (p < 0.05) among different water treatments at the same fertilizer addition, and ns indicates non-significant differences (p > 0.05) among water treatments."

Fig. 5

Effects of fertilization and water on above-ground biomass of Leymus chinensis (mean ± SE). CK, control; NA, N addition; PA, P addition; N+P, N and P additions; LW, MW, HW represent low, moderate and high precipitation levels. Different lowercase letters indicate significant difference (p < 0.05) among different water treatments at the same fertilizer addition, and ns indicates non-significant differences (p > 0.05) among water treatments."

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