降水量变化下荒漠草原土壤呼吸及其影响因素

降水量变化下荒漠草原土壤呼吸及其影响因素

李冰, 朱湾湾, 韩翠, 余海龙, 黄菊莹

Soil respiration and its influencing factors in a desert steppe in northwestern China under changing precipitation regimes

LI Bing, ZHU Wan-Wan, HAN Cui, YU Hai-Long, HUANG Ju-Ying

表3 降水量变化对8月荒漠草原土壤性质和植物特征的影响(平均值±标准误)

Table 3 Effects of precipitation change on soil properties and plant characteristics in August in a desert steppe (mean ± SE)

指标 Index	处理 Treatment
指标 Index	W1	W2	W3	W4	W5
pH	8.52 ± 0.05^bc	8.58 ± 0.04^ab	8.43 ± 0.04^c	8.67 ± 0.05^a	8.66 ± 0.04^a
EC	89.97 ± 0.88^a	93.37 ± 2.44^a	128.70 ± 18.49^a	289.67 ± 22.93^a	358.00 ± 38.19^a
SOC	2.96 ± 0.08^b	3.25 ± 0.50^ab	3.34 ± 0.17^ab	3.38 ± 0.24^ab	3.70 ± 0.12^a
TN	0.48 ± 0.00^a	0.49 ± 0.01^a	0.48 ± 0.01^a	0.43 ± 0.02^b	0.43 ± 0.01^b
TP	0.34 ± 0.00^a	0.29 ± 0.00^b	0.27 ± 0.01^c	0.28 ± 0.00^bc	0.27 ± 0.00^c
NO₃^--N	5.50 ± 0.41^a	5.08 ± 0.76^ab	3.28 ± 0.05^b	5.19 ± 0.91^a	5.81 ± 0.42^a
NH₄⁺-N	2.91 ± 0.23^a	3.59 ± 0.68^a	5.44 ± 1.12^a	5.71 ± 1.84^a	5.31 ± 3.34^a
AP	1.56 ± 0.13^a	1.62 ± 0.51^a	1.72 ± 0.28^a	2.14 ± 0.30^a	2.47 ± 0.68^a
SA	318.41 ± 33.75^c	359.39 ± 41.44^bc	381.78 ± 33.90^abc	434.93 ± 36.46^ab	474.67 ± 30.07^a
UA	27.85 ± 3.86^b	30.68 ± 0.67^b	30.95 ± 1.96^b	45.34 ± 4.52^a	45.70 ± 4.82^a
PA	44.58 ± 0.32^bc	40.89 ± 3.01^c	43.88 ± 2.97^bc	49.02 ± 2.42^ab	55.60 ± 1.35^a
MBC	99.05 ± 9.57^ab	77.05 ± 20.59^ab	46.68 ± 14.32^b	100.24 ± 27.02^ab	108.73 ± 8.91^a
MBN	48.97 ± 2.28^a	5.90 ± 0.80^a	7.45 ± 1.74^a	15.10 ± 7.95^a	19.91 ± 8.67^a
MBP	1.76 ± 0.73^b	3.56 ± 0.40^a	1.76 ± 0.76^b	1.14 ± 0.34^b	2.00 ± 0.34^ab
R	5.00 ± 0.58^b	6.67 ± 0.88^ab	6.00 ± 1.00^ab	8.67 ± 1.20^a	8.67 ± 0.88^a
H'	1.13 ± 0.14^c	1.31 ± 0.07^bc	1.49 ± 0.10^ab	1.43 ± 0.02^ab	1.66 ± 0.08^a
E	0.70 ± 0.03^b	0.70 ± 0.06^b	0.86 ± 0.04^a	0.67 ± 0.04^b	0.77 ± 0.00^ab
D	0.43 ± 0.06^a	0.37 ± 0.05^ab	0.27 ± 0.02^bc	0.36 ± 0.04^abc	0.24 ± 0.02^c