Study on the characteristics of leaf functional traits of Tirpitzia sinensis in different habitats of Karst landform

doi:10.12302/j.issn.1000-2006.202304021

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (1): 162-170.doi: 10.12302/j.issn.1000-2006.202304021

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Study on the characteristics of leaf functional traits of Tirpitzia sinensis in different habitats of Karst landform

WANG Meiquan¹(), GUAN Qingwei¹^,^*(), HUANG Zongsheng², YUAN Zaixiang¹, ZHAO Jiahao¹

1. Co-Innovation Center for Sustainable Forestry in Southern China, College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China
2. College of Architecture and Urban Planning, Guizhou University, Guiyang 550025, China

Received:2023-04-18 Revised:2023-11-22 Online:2025-01-30 Published:2025-01-21
Contact: GUAN Qingwei E-mail:xiaocuipi@njfu.edu.cn;guanjapan999@163.com

Abstract

Abstract:

【Objective】This study aims to investigate the characteristics of leaf functional traits in Tirpitzia sinensis across different Karst fissure networks, and provide a theoretical basis for understanding plant growth adaptability mechanisms in Karst areas.【Method】In this study, we selected typical dominant shrub habitats of T. sinensis with various rock fissure characteristics: high dip angle, short track length, fewer turns, multiple connections, high density, and aggregation type (type Ⅰ); moderate dip angle, moderate track length, multiple turns, moderate connections, moderate density, and uniform type (type Ⅱ); and low dip angle, long track length, moderate turns, fewer connections, low density, and random type (type Ⅲ). We investigated the response of leaf functional traits to different rock fissure networks and soil physicochemical properties using One-way analysis of variance and correlation analysis. 【Result】The nutrient and water contents of fissure soil were the highest in type Ⅰ rocky habitats, followed by type Ⅱ, and the lowest in type Ⅲ, while soil pH showed an opposite trend. Soil nutrients in type Ⅲ were significantly lower than in type Ⅰ (P < 0.05), but there were no significant differences in soil pH or water content. Significant differences were found in leaf chemical traits among different rocky habitats (P < 0.05), but not in structural traits. Leaf nutrient concentration and specific leaf area were highest in type Ⅰ, followed by type Ⅱ and the lowest in type Ⅲ, with leaf dry matter content showing the opposite trend. Leaf N/P mass ratios and leaf thickness were the highest in type Ⅱ, followed by type Ⅲ, and the lowest in type Ⅰ. The dip angle and connectivity of rock fissures were the main factors affecting soil physicochemical properties. Soil organic carbon, total nitrogen, available nitrogen, and available phosphorus content were the primary factors influencing leaf chemical traits and leaf area, which were significantly affected by the connectivity of the rock fissure network. The leaf nitrogen/phosphorus mass ratio was higher than 16 across the three rocky habitats, which indicated that T. sinensis growth was phosphorus-limited. Compared with other Karst shrubs in the same area, the growth rates of T. sinensis in the three rocky habitats were slower, reflecting a more conservative nutritional investment strategy. 【Conclusion】The rock fissure network indirectly affects leaf functional traits primarily by altering soil physicochemical properties, with leaf chemical traits showing greater plasticity than structural traits. In type Ⅲ rocky habitats, T. sinensis is most susceptible to nutrient stress, demonstrating pronounced tolerance to nutrient-poor conditions in its leaf functional traits.

Key words: rocky habitat, rock fracture network structure, soil physicochemical property, leaf functional trait

CLC Number:

S793.9

WANG Meiquan, GUAN Qingwei, HUANG Zongsheng, YUAN Zaixiang, ZHAO Jiahao. Study on the characteristics of leaf functional traits of Tirpitzia sinensis in different habitats of Karst landform[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2025, 49(1): 162-170.

Figures/Tables 5

Table 1

Table 2

Basic situation of different rocky habitats"

类型 type			坡度、坡向、海拔 slope, aspect, altitude
Ⅰ	108°01'19″~ 108°05'46″E, 25°07'57″~ 25°15'52″N	石灰土 5~30 cm	20°~35° 西南 630~670 m	60~80	青冈栎Querus glauca/17.16 构树Broussonetia papyrifera/12.86 掌叶木Handeliodendron bodinieri/5.82	马桑Coriaria nepalensis/19.34 青篱柴Tirpitzia sinensis/11.83 石岩枫Mallotus repandus/10.80	常绿落叶阔叶混交林	复层异龄混交林,郁闭度0.7以上。林下凋落物层约2~4 cm,地表土层分布不均。岩石裂隙发育程度高,优势组结构面裂隙以纵向延伸为主
Ⅱ	108°01'14″~ 108°07'29″E, 25°14'35″~ 25°17'32″N	石灰土 5~30 cm	25°~40° 西南 590~680 m	60~70	构树/21.33 羊蹄甲Bauhinia purpurea L./8.65 翅荚香槐Platyosprion platycarpum/7.68	青篱柴/21.22 裂果卫矛Euonymus dielsianus/10.23 水麻Debregeasia orientalis/6.72	常绿落叶阔叶混交林	复层异龄混交林,郁闭度0.7以上。林下凋落物层约2~4 m,地表土层分布不均。岩石裂隙发育程度适中,优势组结构面裂隙以倾斜方向延伸为主
Ⅲ	107°54'58″~ 108°03'29″E, 25°22'04″~ 25°28'13″N	石灰土 5~20 cm	25°~40° 西南 620~700 m	60~70	羊蹄甲/23.02 香叶树Lindera communis/15.25 云贵鹅耳枥Carpinus pubescens/8.47	裂果卫矛/17.22 青篱柴/11.88 粗糠柴Mallotus philippensis/6.32	常绿落叶阔叶混交林	复层异龄混交林,郁闭度0.6以上。林下凋落物层约2~3 cm,地表土壤分布较均匀。岩石裂隙发育程度低,优势组结构面裂隙以横向延伸为主

Table 2

Fig. 1

Fig. 2

Fig. 3

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类型 type	样地数 plot count	占比/% proportion	平均迹长/m trace length	分维数 fractal dimension	间隙度 lacunarity	倾角/(°) dip angle	整合度 integration	连接度 connectivity
Ⅰ	31	67.39	2.31±2.07 a	1.24±0.12 a	1.41±0.14 a	54.78±3.82 a	0.68±0.10 a	1.91±0.17 a
Ⅱ	10	21.74	2.72±0.50 a	1.22±0.10 a	1.37±0.19 a	28.59±6.60 b	0.55±0.06 a	1.79±0.15 a
Ⅲ	5	10.87	5.62±0.52 b	1.21±0.10 a	1.29±0.20 a	10.53±10.3 c	0.56±0.11 a	1.77±0.07 a

Study on the characteristics of leaf functional traits of Tirpitzia sinensis in different habitats of Karst landform

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