Abstract
Leymus chinensis (Trin.) is the dominant vegetation type in eastern Eurasian temperate grasslands but is decreasing due to the combined pressure of reduced precipitation and overgrazing. This study evaluated the separate and combined effects of precipitation and defoliation on net primary productivity (NPP) and composition of a L. chinensis steppe to promote the sustainable development of temperate grasslands through improved management practices. The effects of three precipitation gradients (precipitation unchanged, reduced by 50%, and increased by 50%) and two clipping intensities (clipping once or twice per year) were examined on NPP and composition of the L. chinensis community using a 7-year in situ controlled trial at the Guyuan State Key Monitoring and Research Station of Grassland Ecosystem in China. The results showed that: (1) a 50% reduction in natural precipitation significantly decreased NPP; a 50% increase in precipitation did not significantly increase NPP, but it decreased the importance value of L. chinensis because more water promoted the growth of competing species. (2) Clipping twice per year increased NPP, but the increase was from the dry matter of other species (DMO) component, and not from the dry matter of L. chinensis. (3) The standardized coefficients of a regression model (β) for DMO, NPP, and the importance value of L. chinensis were 0.685, 0.532, and -0.608 for precipitation, and 0.369, 0.419, and -0.276 for clipping mode, respectively. This study demonstrated that variation in precipitationis the key driver of NPP and composition of a L. chinensis steppe under the precipitation range and clipping intensities evaluated. This improved understanding of the effects of precipitation and clipping on NPP and composition will allow for improved, sustainable management of L. chinensis temperate grassland steppes.
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Claims 13
Claim · model-written summary
A 50% reduction in natural precipitation significantly decreased NPP.
Verbatim
e0“Leymus chinensis (Trin.)”
e1“a 50% reduction in natural precipitation significantly decreased NPP”
Claim · model-written summary
A 50% precipitation increase did not significantly increase NPP.
Verbatim
e0“Leymus chinensis (Trin.)”
e1“a 50% increase in precipitation did not significantly increase NPP”
Claim · model-written summary
A 50% precipitation increase decreased the importance value of L. chinensis.
Verbatim
e0“Leymus chinensis (Trin.)”
e1“a 50% increase in precipitation did not significantly increase NPP, but it decreased the importance value of L. chinensis”
Claim · model-written summary
More water promoted competing species growth.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- more watere1
- Outcome
- growth of competing speciese1
- Direction
- promotede1
Not reportedComparator
Verbatim
e0“Leymus chinensis (Trin.)”
e1“more water promoted the growth of competing species”
Claim · model-written summary
Clipping twice per year increased NPP.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- Clipping twice per yeare1
- Outcome
- NPPe1
- Direction
- increasede1
Not reportedComparator
Verbatim
e0“Leymus chinensis (Trin.)”
e1“Clipping twice per year increased NPP”
Claim · model-written summary
Clipping twice per year increased the dry matter of other species component.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- Clipping twice per yeare2
- Outcome
- dry matter of other species (DMO)e1
- Direction
- increasee1
Not reportedComparator
Verbatim
e0“Leymus chinensis (Trin.)”
e1“the increase was from the dry matter of other species (DMO) component”
e2“Clipping twice per year increased NPP”
Claim · model-written summary
Clipping twice per year did not increase L. chinensis dry matter.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- Clipping twice per yeare2
- Outcome
- dry matter of L. chinensise1
- Direction
- note1
Not reportedComparator
Verbatim
e0“Leymus chinensis (Trin.)”
e1“not from the dry matter of L. chinensis”
e2“Clipping twice per year increased NPP”
Claim · model-written summary
Precipitation had a standardized regression coefficient of 0.685 for DMO.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- precipitatione1
- Outcome
- DMOe1
- Value
- 0.685e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“standardized coefficients of a regression model (β) for DMO, NPP, and the importance value of L. chinensis were 0.685, 0.532, and -0.608 for precipitation”
Claim · model-written summary
Precipitation had a standardized regression coefficient of 0.532 for NPP.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- precipitatione1
- Outcome
- NPPe1
- Value
- 0.532e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“standardized coefficients of a regression model (β) for DMO, NPP, and the importance value of L. chinensis were 0.685, 0.532, and -0.608 for precipitation”
Claim · model-written summary
Precipitation had a standardized regression coefficient of -0.608 for L. chinensis importance value.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- precipitatione1
- Outcome
- importance value of L. chinensise1
- Value
- -0.608e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“standardized coefficients of a regression model (β) for DMO, NPP, and the importance value of L. chinensis were 0.685, 0.532, and -0.608 for precipitation”
Claim · model-written summary
Clipping mode had a standardized regression coefficient of 0.369 for DMO.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- clipping modee1
- Outcome
- DMOe2
- Value
- 0.369e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“0.369, 0.419, and -0.276 for clipping mode”
e2“the increase was from the dry matter of other species (DMO) component”
Claim · model-written summary
Clipping mode had a standardized regression coefficient of 0.419 for NPP.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- clipping modee1
- Outcome
- NPPe2
- Value
- 0.419e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“0.369, 0.419, and -0.276 for clipping mode”
e2“a 50% reduction in natural precipitation significantly decreased NPP”
Claim · model-written summary
Clipping mode had a standardized regression coefficient of -0.276 for L. chinensis importance value.
- Taxon
- Leymus chinensis (Trin.)Leymus chinensise0
- Treatment
- clipping modee1
- Outcome
- importance value of L. chinensise2
- Value
- -0.276e1
Not reportedDirection
Verbatim
e0“Leymus chinensis (Trin.)”
e1“0.369, 0.419, and -0.276 for clipping mode”
e2“a 50% increase in precipitation did not significantly increase NPP, but it decreased the importance value of L. chinensis”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.