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Network Characteristics and Driving Factors of Leaf Trait Networks Along a Gradient of Rocky Desertification
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DOI：10.1016/j.pld.2026.07.011.png)
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Abstract
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• Karst degradation rewires the trait network: desertification appears to be associated with a shift from a robust, synergistic whole-species integration of traits to a more fragile and loosely connected one. • Modularity: Peak modularity at intermediate degradation represents a nonlinear pattern , aligning with and extending the Intermediate Disturbance Hypothesis (IDH) from species diversity to functional trait network architecture. • Dominant hub traits shift along the stress gradient: from photosynthetic-structural traits (LA, N, LMA) under light stress, to physiological regulators (SLN, SLA) at moderate stress, and finally to economic strategists (N/P, LA) under extreme stress. • Calcium: In severe karst degradation, soil Ca emerges as the dominant force reshaping leaf trait networks, overriding traditional nutrient constraints.
Keywords:
Leaf trait network
Rocky desertification gradient
Plant functional traits
Soil properties
Chl
Leaf chlorophyll content
LA
Leaf area
LT
Leaf thickness
SLA
Specific leaf area
LDMC
Leaf dry matter content
LTD
Leaf tissue density
LMA
Leaf mass per area
LWC
Leaf water content
LDW
Leaf dry weights
LFW
leaf fresh weights
LSI
Leaf succulence index
SLC
Specific leaf carbon
SLN
Specific leaf nitrogen
SLP
Specific leaf phosphorus
LC
Leaf carbon content
LN
Leaf nitrogen content
LP
Leaf phosphorus content
N/P
Leaf nitrogen-to-phosphorus ratio
C/P
Leaf carbon-to-phosphorus ratio
C/N
Leaf carbon-to-nitrogen ratio
pH
Soil pH
SOC
Soil organic matter content
BD
Soil bulk density
TN
Soil total nitrogen
TP
Soil total phosphorus
TK
Soil total potassium
Ca
Soil calcium
SWC
Soil water content
LRD
Light rocky desertification
MRD
Moderate rocky desertification
SRD
Severe rocky desertification
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