Chin J Plant Ecol ›› 2018, Vol. 42 ›› Issue (11): 1094-1102.DOI: 10.17521/cjpe.2018.0140
Special Issue: 青藏高原植物生态学:群落生态学
• Research Articles • Previous Articles Next Articles
ZHOU Wei1,LI Hong-Bo2,*(),ZENG Hui1
Received:
2018-06-11
Accepted:
2018-10-16
Online:
2018-11-20
Published:
2019-03-13
Contact:
Hong-Bo LI
Supported by:
ZHOU Wei, LI Hong-Bo, ZENG Hui. Variations of root traits in three Xizang grassland communities along a precipitation gradient[J]. Chin J Plant Ecol, 2018, 42(11): 1094-1102.
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地点 Site | 经纬度 Latitude and longitude | 年平均气温 Mean annual temperature (℃) | 年降水量 Mean annual precipitation (mm) | 海拔 Elevation (m) | 土壤氮含量 Soil N (%) | 土壤碳含量 Soil C (%) | 土壤碳氮比 Soil C:N |
---|---|---|---|---|---|---|---|
那曲 Nagqu | 31.65° N, 92.02° E | -2.2 | 445 | 4 600 | 0.193 | 1.965 | 22.97 |
班戈 Baingoin | 31.43° N, 90.03° E | -1.2 | 329 | 4 700 | 0.117 | 1.081 | 13.93 |
尼玛 Nyima | 32.08° N, 86.90° E | -3.1 | 286 | 4 780 | 0.115 | 2.062 | 18.24 |
Table 1 Basic information of the sampling sites of root in Xizang alpine grassland communities
地点 Site | 经纬度 Latitude and longitude | 年平均气温 Mean annual temperature (℃) | 年降水量 Mean annual precipitation (mm) | 海拔 Elevation (m) | 土壤氮含量 Soil N (%) | 土壤碳含量 Soil C (%) | 土壤碳氮比 Soil C:N |
---|---|---|---|---|---|---|---|
那曲 Nagqu | 31.65° N, 92.02° E | -2.2 | 445 | 4 600 | 0.193 | 1.965 | 22.97 |
班戈 Baingoin | 31.43° N, 90.03° E | -1.2 | 329 | 4 700 | 0.117 | 1.081 | 13.93 |
尼玛 Nyima | 32.08° N, 86.90° E | -3.1 | 286 | 4 780 | 0.115 | 2.062 | 18.24 |
根属性 Root trait | 最小值 Min. | 最大值 Max. | 平均值 Mean | 变异系数 Coefficient of variation (%) |
---|---|---|---|---|
一级根直径 1st-order root diameter (mm) | 0.073 | 0.142 | 0.088 | 22.76 |
一级根长度 1st-order root length (mm) | 0.335 | 5.239 | 1.541 | 80.19 |
根系分支强度 Root branching intensity (No.cm-1) | 1.119 | 12.041 | 4.439 | 61.05 |
Table 2 Summary of the three root traits for 22 species in Xizang alpine grassland
根属性 Root trait | 最小值 Min. | 最大值 Max. | 平均值 Mean | 变异系数 Coefficient of variation (%) |
---|---|---|---|---|
一级根直径 1st-order root diameter (mm) | 0.073 | 0.142 | 0.088 | 22.76 |
一级根长度 1st-order root length (mm) | 0.335 | 5.239 | 1.541 | 80.19 |
根系分支强度 Root branching intensity (No.cm-1) | 1.119 | 12.041 | 4.439 | 61.05 |
根属性 Root trait | 一级根直径 1st-order root diameter | 分支强度 Root branching intensity | 一级根长度 1st-order root length |
---|---|---|---|
一级根直径 1st-order root diameter | -0.008ns | 0.672** | |
根系分支强度 Root branching intensity | -0.432* | -0.139ns | |
一级根长度 1st-order root length | 0.728** | -0.573** |
Table 3 Pearson correlations with (top right) and without (bottom left) phylogenetically independent contrasts for root traits across 22 species in Xizang alpine grassland
根属性 Root trait | 一级根直径 1st-order root diameter | 分支强度 Root branching intensity | 一级根长度 1st-order root length |
---|---|---|---|
一级根直径 1st-order root diameter | -0.008ns | 0.672** | |
根系分支强度 Root branching intensity | -0.432* | -0.139ns | |
一级根长度 1st-order root length | 0.728** | -0.573** |
Fig. 3 Root trait mean values of seven regionally common species (appearing in two or three sites at the same time) at three grassland sites (mean + SE) in Xizang alpine grassland. Ad, Artemisia demissa; Ts, Trisetum spicatum; Lp, Leontopodium pusillum; Sp, Stipa purpurea; Pb, Potentilla bifurca; Om, Oxytropis microphylla; Hs, Heteropappus semiprostratus.
Fig. 4 The average percentage of root traits of seven regionally common species (appearing in two or three sites at the same time) to water stress at three grassland sites in Xizang alpine grassland. Ad, Artemisia demissa; Ts, Trisetum spicatum; Lp, Leontopodium pusillum; Sp, Stipa purpurea; Pb, Potentilla bifurca; Om, Oxytropis microphylla; Hs, Heteropappus semiprostratus.
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