Table 1. Soil characteristics of different sampling sites in this experiment.

Site	Characteristic
	Moisturea (%)	pHb	Organic matterc (g/Kg)	Total Nd (g/Kg)	NH4+-Ne (mg/Kg)	NO3—Ne (mg/Kg)	Total Pf (g/Kg)
Eleocharis valleculosa	89.74 ± 2.51	7.10 ± 0.12	91.62 ± 0.13	1.728 ± 0.0031	21.06 ± 0.037	0.0125 ± 0.0017	0.4913 ± 0.0028
Polygonum amphibium	63.71 ± 1.38	7.45 ± 0.015	74.68 ± 0.58	1.689 ± 0.0027	8.798 ± 0.040	0.0325 ± 0.0021	0.7026 ± 0.0071
Carex muliensis	77.77 ± 2.41	7.08 ± 0.11	102.2 ± 0.79	1.680 ± 0.0074	16.53 ± 0.015	0.1025 ± 0.013	0.4471 ± 0.0051

Analysis was performed at the Laboratory of Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences.

Mean ± SE_mean, n = 3.

^aMeasured by drying at 105 °C overnight and weighing.

^bMeasured by mixing wet weight soil with distilled water at a ratio of 1:1(w/w).

^cDetermined by external heating-potassium dichromate volumetric method.

^dDetermined by the Kjeldahl method.

^eDetermined by a flow analyzer.

^fMeasured by perchloric acid-concentrated sulfuric acid digestion- molybdenum, antimony anti colorimetry.