Chin Bull Bot ›› 2020, Vol. 55 ›› Issue (3): 308-317.doi: 10.11983/CBB19231

• EXPERIMENTAL COMMUNICATIONS • Previous Articles     Next Articles

Patterns and Influence Factors of Fine Root Turnover in Forest Ecosystems

Jianing Zhao1,Yun Liang2,Ying Liu3,Yujue Wang1,Qianru Yang1,Chunwang Xiao1,*()   

  1. 1College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
    2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    3College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, China
  • Received:2019-11-29 Accepted:2020-02-26 Online:2020-07-06 Published:2020-05-01
  • Contact: Chunwang Xiao E-mail:cwxiao@muc.edu.cn

Abstract:

Root turnover is a key process in the carbon cycle of terrestrial ecosystems, and plays an important role in studying soil carbon pool changes and global climate change. Various methods for measuring root turnover rate have been described, from which highly variable results are obtained. Moreover, the studies on root turnover in large regional scales are not sufficient, making the patterns of root turnover in global forest ecosystem still not clear. This study integrates the fine root turnover spatial pattern of five forest types in the world by collecting literature data and unifying the calculation method of turnover rate. Combined with soil physical and chemical properties and climate data, several factors driving the fine root turnover of forest ecosystems are obtained. We show that there was a significant difference in the different forest ecosystems and the fine root turnover rate almost decreased with the increase of latitude. The fine root turnover rate of forest ecosystems was positively correlated to the mean annual temperature and the mean annual precipitation. The fine root turnover rate of forest ecosystems was positively correlated to the soil organic carbon content but negatively correlated to soil pH. This study provides a model to study the fine root turnover laws and mechanisms of forest ecosystems.

Key words: fine root turnover, global forest scale, climate factor, soil properties

Table 1

Distribution of study sites (see Appendix 1 for data sources)"

Plot Continent Country Longitude and latitude Plot Continent Country Longitude and latitude
1 Asia India 77°15'E, 8°28'59"N 36 Asia China 128°5'40.56"E, 42°23'57.48"N
2 Asia India 76°49'59"E, 9°22'1"N 37 Asia China 128°4'59.88"E, 42°24'N
3 Asia India 77°25'58.8"E, 9°31'58.8"N 38 Asia China 128°6'29.16"E, 42°25'15.24"N
4 Asia India 79°55'1.2"E, 12°10'58.8"N 39 Asia China 128°30'E, 43°4'58.8"N
5 Asia China 110°31'19.2"E, 20°1'1.2"N 40 Asia China 127°31'48"E, 44°22'48"N
6 Asia China 112°49'58.8"E, 22°34'1.2"N 41 Asia China 88°13'48"E, 44°37'12"N
7 Asia China 117°18'E, 23°35'24"N 42 Asia Japan 142°6'E, 45°3'N
8 Asia India 91°55'58.8"E, 25°34'1.2"N 43 Asia China 128°53'13.2"E, 47°10'51.6"N
9 Asia China 117°57'E, 26°28'1.2"N 44 Asia China 127°54'36"E, 47°13'48"N
10 Asia China 110°7'58.8"E, 27°9'N 45 North America Panama 82°15'W, 8°45'N
11 Asia China 119°10'48"E, 27°52'12"N 46 North America Puerto Rico 65°49'1.2"W, 18°40'1.2"N
12 Asia China 113°1'48"E, 28°7'12"N 47 North America USA 84°30'W, 31°15'N
13 Asia China 91°19'58.8"E, 29°40'1.2"N 48 North America USA 92°W, 32°N
14 Asia China 121°46'58.8"E, 29°48'N 49 North America USA 111°45'W, 35°16'1.2"N
15 Asia China 103°25'1.2"E, 29°58'58.8"N 50 North America USA 76°27'43.2"W, 36°31'58.8"N
16 Asia China 102°48'E, 30°1'1.2"N 51 North America USA 82°22'1.2"W, 39°10'58.8"N
17 Asia China 117°24'E, 30°22'12"N 52 North America USA 78°45'57.6"W, 41°35'52.8"N
18 Asia China 117°43'48"E, 30°22'48"N 53 North America USA 72°11'24"W, 42°31'51.6"N
19 Asia India 79°56'24"E, 30°28'58.8"N 54 North America USA 71°45'W, 43°55'58.8"N
20 Asia China 117°53'24"E, 30°34'48"N 55 North America USA 72°13'1.2"W, 44°N
21 Asia China 117°54'E, 30°34'48"N 56 North America USA 122°13'1.2"W, 44°13'58.8"N
22 Asia China 121°54'25.2"E, 30°52'55.2"N 57 North America USA 121°34'1.2"W, 44°25'58.8"N
23 Asia India 75°40'12"E, 30°54'N 58 North America USA 68°41'6"W, 44°55'19.2"N
24 Asia China 119°13'58.8"E, 31°58'58.8"N 59 North America USA 122°W, 46°N
25 Asia Japan 131°12'E, 32°3'N 60 North America Canada 89°28'58.8"W, 49°32'24"N
26 Asia China 108°7'58.8"E, 33°58'1.2"N 61 Europe Italy 14°33'E, 41°43'1.2"N
27 Asia Japan 135°37'1.2"E, 34°4'58.8"N 62 Europe France 3°49'4.8"E, 43°41'16.8"N
28 Asia China 116°49'58.8"E, 35°52'58.8"N 63 Europe France 4°37'48"E, 49°45'36"N
29 Asia Japan 104°7'55.2"E, 36°N 64 Europe Germany 10°26'2.4"E, 51°4'48"N
30 Asia Japan 140°13'1.2"E, 36°6'N 65 Europe Belgium 3°51'E, 51°6'N
31 Asia Korea 127°42'E, 37°30'N 66 Europe Estonia 26°45'E, 58°46'1.2"N
32 Asia China 112°31'1.2"E, 37°39'N 67 Europe Finland 30°58'1.2"E, 62°46'58.8"N
33 Asia China 115°25'8.4"E, 39°57'N 68 South America Brazil 56°58'59"W, 3°4'1"S
34 Asia China 87°51'25.2"E, 40°27'57.6"N 69 South America Brazil 47°56'56"W, 1°17'53"S
35 Asia China 117°15'E, 42°19'12"N 70 Africa C?te d'Ivoire 5°13'1.2"W, 6°16'59"N

Figure 1

Patterns of fine root turnover rate in forest ecosystems with latitude ** indicates significant correlation at the 0.01 level."

Table 2

Fine root turnover rate in different types of forest ecosystem"

Forest type Data number Means ± SE
Tropical rainforest 11 1.312±0.182 a
Subtropical evergreen broad-leaved forest 9 0.802±0.161 b
Warm temperate deciduous broad-leaved forest 13 0.724±0.859 b
Temperate coniferous and broad-leaved mixed forest 30 0.766±0.995 b
Cold temperate coniferous forest 7 0.602±0.106 b

Figure 2

Relationships between fine root turnover rate in forest ecosystems and mean annual temperature (A) and mean annual precipitation (B) * indicates significant correlation at the 0.05 level."

Figure 3

Relationships between forest fine root turnover rate and soil physical and chemical properties CEC: Soil cation exchange capacity. * indicates significant correlation at the 0.05 level."

Table 3

Pearson correlations among latitude, mean annual temperature, mean annual precipitation, soil organic carbon content, soil pH, soil bulk density, CEC, sand fraction, silt fraction, clay fraction, and fine root turnover rate"

MAT MAP Soil
organic carbon
Soil pH Soil bulk density CEC Sand
fraction
Clay
fraction
Silt
fraction
lg (fine root turnover rate)
Latitude -0.867** -0.609** -0.164 0.168 0.348** 0.157 0.124 0.097 0.105 -0.367**
MAT 0.576** -0.029 -0.009 -0.332** -0.03 -0.211 -0.011 0.361** 0.233*
MAP -0.101 -0.094 -0.254* -0.048 -0.167 0.052 0.221 0.240*
Soil organic carbon -0.449** 0.14 0.11 0.126 -0.171 0.029 0.254*
Soil pH 0.026 0.235 -0.041 0.231 -0.165 -0.297*
Soil bulk density -0.464** 0.900** -0.599** -0.852** -0.098
CEC -0.545** 0.376* 0.491** -0.071
Sand fraction -0.823** -0.772** 0.038
Clay fraction 0.284* -0.146
Silt fraction 0.104
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