Dissecting the multi-scale spatial relationship of earthworm assemblages with soil environmental variability

Jiménez, Juan J; Decaëns, Thibaud; Lavelle, Patrick; Rossi, Jean-Pierre

doi:10.1186/s12898-014-0026-4

BMC Ecology

Table 4 Cross-correlograms of the root- and soil physical variables (significant Bonferroni corrected two-sided p-values (0.05/11 = 0.0045) for each distance class were tested using 999 permutations under the null hypothesis)

From: Dissecting the multi-scale spatial relationship of earthworm assemblages with soil environmental variability

Variables		Distance (number of pair points)											Global
Plant below-ground¹	Physical	5.0 (360)	8.5 (644)	12.8 (1112)	17.5 (1192)	22.6 (1548)	27.5 (1264)	32.1 (1128)	36.9 (1108)	42.0 (848)	47.3 (516)	52.8 (120)	significance, p’
FiRL	Agg0.053-0.125	−0.121 *	0.010	0.080 **	−0.001	0.036	−0.012	−0.061 *	−0.034	0.046	−0.038	0.067	NS
	Agg0.125-0.25	−0.005	0.103 **	0.106 ***	0.038	0.037	−0.059 *	−0.096 **	−0.055 *	0.030	−0.069	−0.112	Significant
	Agg0.25-0.5	0.010	0.060	0.099 ***	0.049 *	0.043 *	−0.040	−0.068 **	−0.069 **	0.032	−0.131 **	−0.058	Significant
	Agg0.5-1	0.043	0.125 **	0.106 ***	0.054 *	0.029	−0.057	−0.069 *	−0.073 *	−0.008	−0.144 **	−0.098	Significant
	Agg1-2	0.037	0.089 **	0.065 **	0.074 **	0.022	−0.063 **	−0.058 *	−0.037	0.013	−0.133 **	−0.095	Significant
	Agg2-5	0.143 **	0.127 **	0.080 **	0.061 *	0.016	−0.053 *	−0.068 *	−0.073 **	−0.025	−0.096 *	−0.164	Significant
	Agg5-10	−0.038	−0.027	−0.104 **	−0.008	−0.030	0.031	0.023	0.031	0.028	0.025	0.243 **	Significant
	Agg > 10	−0.107 *	−0.127 **	−0.085 **	−0.057 *	−0.006	0.045	0.059 *	0.074 *	−0.005	0.137 **	0.062	Significant
	BD	−0.022	−0.045	−0.025	−0.015	−0.002	0.011	−0.001	0.028	−0.015	0.090 *	0.127	NS
	Comp	−0.128 **	−0.064	−0.047	0.011	0.009	0.003	0.013	0.041	−0.017	0.115 **	0.167 *	NS
	Conduc	0.149 **	0.123 **	0.076 **	−0.002	0.003	−0.044	−0.031	−0.034	−0.029	−0.109 *	−0.211 *	Significant
	Hum	−0.233 **	−0.125 **	−0.118 **	−0.029	0.019	0.048	0.073 *	0.078 **	0.003	0.102 *	0.219 *	Significant
CoRL	Agg0.053-0.125	0.025	0.016	0.040	0.038	0.019	−0.052	−0.022	−0.054	−0.020	0.034	0.030	NS
	Agg0.125-0.25	0.099 *	0.121 **	0.092 ***	0.063 *	0.003	−0.075 **	−0.056 *	−0.094 **	−0.058	−0.006	0.035	Significant
	Agg0.25-0.5	0.087 *	0.111 **	0.093 **	0.074 **	−0.001	−0.049 *	−0.036	−0.108 **	−0.067 *	−0.037	−0.086	Significant
	Agg0.5-1	0.123	0.173 ***	0.095 ***	0.071 **	0.006	−0.063 **	−0.061 *	−0.114 **	−0.078 *	−0.035	−0.052	Significant
	Agg1-2	0.085 *	0.104 **	0.069 *	0.046 *	0.015	−0.038	−0.033	−0.070 *	−0.090 *	−0.023	−0.088	Significant
	Agg2-5	0.156 ***	0.173 ***	0.098 ***	0.058	−0.003	−0.058 *	−0.062 *	−0.102 **	−0.081 *	−0.072	0.008	Significant
	Agg5-10	−0.057	0.000	−0.080 **	−0.051 *	0.007	−0.035	0.029	0.060 *	0.080 **	0.062	0.034	Significant
	Agg > 10	−0.133 **	−0.174 **	−0.082 **	−0.070 **	−0.013	0.067 *	0.059 *	0.119 ***	0.074 *	0.048	0.055	Significant
	BD	−0.061	−0.061	−0.053 *	−0.014	0.008	0.030	0.022	0.013	0.024	0.070 *	−0.068	NS
	Comp	−0.027	−0.064	−0.040	−0.041	−0.006	0.000	0.027	0.035	0.045	0.086 *	0.044	NS
	Conduc	0.068	0.149 ***	0.064 *	0.031	−0.005	−0.015	−0.038	−0.049	−0.070 *	−0.102 **	−0.017	Significant
	Hum	−0.123 **	−0.163 **	−0.114 **	−0.030	0.018	0.011	0.087 ***	0.070 **	0.070 *	0.088 *	0.068	Significant
FiRW	Agg0.053-0.125	−0.099 *	0.017	0.073 **	0.014	0.004	−0.027	−0.050	−0.022	0.055	0.006	0.032	NS
	Agg0.125-0.25	−0.134 **	−0.033	−0.007	−0.033	−0.008	−0.055 *	−0.024	0.041	0.149 ***	0.100 **	0.070	Significant
	Agg0.25-0.5	−0.087 *	−0.043	0.001	−0.041	−0.001	−0.030	−0.010	0.015	0.144 ***	0.016	0.080	Significant
	Agg0.5-1	−0.069	−0.020	0.004	−0.051 *	−0.006	−0.030	0.017	0.013	0.092 ***	−0.008	0.100	Significant
	Agg1-2	−0.073	−0.018	−0.064 *	−0.048	0.001	−0.014	0.032	0.043	0.107 ***	−0.021	0.081	Significant
	Agg2-5	−0.098 *	−0.082 *	−0.080 **	−0.065 **	−0.029	−0.026	0.042	0.057 *	0.174 ***	0.086 *	0.093	Significant
	Agg5-10	0.019	0.048	−0.027	0.034	−0.021	0.041	0.009	−0.040	−0.075 *	0.004	0.055	NS
	Agg > 10	0.091 *	0.056	0.063 **	0.057 *	0.036	0.022	−0.039	−0.047 *	−0.155 **	−0.084 *	−0.087	Significant
	BD	0.090 *	0.112 **	0.049	0.060 *	0.049 *	0.000	−0.098 **	−0.082 **	−0.119 **	0.033	−0.015	Significant
	Comp	−0.072	−0.011	−0.014	0.011	0.016	0.020	−0.044 *	0.028	−0.020	0.096 *	0.006	NS
	Conduc	−0.016	−0.055	−0.042	−0.036	−0.052 *	0.010	0.066 *	0.048 *	0.058 *	−0.023	−0.003	NS
	Hum	−0.037	−0.006	0.002	0.017	0.004	0.029	−0.008	0.009	−0.068 *	0.039	−0.011	NS
CoRW	Agg0.053-0.125	0.056	0.001	0.033	0.038	0.000	−0.069 **	−0.012	−0.042	−0.017	0.079 *	0.044	NS
	Agg0.125-0.25	0.135 **	0.112 **	0.076 **	0.042	−0.020	−0.091 **	−0.050	−0.087 **	−0.042	0.076 *	0.097	Significant
	Agg0.25-0.5	0.103 *	0.081 *	0.073 **	0.040	−0.017	−0.076 **	−0.019	−0.082 **	−0.056	0.047	0.037	NS
	Agg0.5-1	0.120 **	0.113 **	0.070 **	0.049	−0.025	−0.083 **	−0.049	−0.073 *	−0.019	0.041	0.029	Significant
	Agg1-2	0.088	0.103 **	0.052 *	0.042	−0.024	−0.056 *	−0.046	−0.047	−0.055	0.062	0.026	Significant
	Agg2-5	0.169 ***	0.165 ***	0.085 **	0.053 *	−0.042 *	−0.083 **	−0.080 **	−0.076 **	−0.036	0.012	0.122	Significant
	Agg5-10	−0.052	0.038	−0.045	−0.008	−0.017	−0.004	−0.010	0.044	0.080 *	−0.010	−0.062	NS
	Agg > 10	−0.140 **	−0.155 **	−0.081 **	−0.054 *	0.029	0.079 **	0.082 ***	0.090 ***	0.038	−0.034	−0.081	Significant
	BD	−0.106 *	−0.096 *	−0.058 *	0.008	0.009	0.060 *	0.033	0.035	0.001	0.018	−0.109	NS
	Comp	0.003	−0.012	−0.007	−0.018	−0.027	0.026	0.006	0.021	−0.024	0.059	0.063	NS
	Conduc	0.047	0.097 **	0.049 *	0.026	−0.026	−0.029	−0.054 *	−0.024	0.007	−0.054	−0.009	NS
	Hum	−0.102 *	−0.084 *	−0.044	−0.018	0.022	0.019	0.056 *	0.052 *	−0.019	0.023	0.052	NS

¹FiRL, fine root length; CoRL, coarse root length; FiRW, fine root weight; CoRW, coarse root weight.
* p < 0.05; ** p < 0.01; *** p < 0.001; NS, not significant.
The number of pair points (within brackets) and the lower and upper limits for each distance class employed while computing the cross-correlograms are indicated.

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