000			02042nam a2200277Ia 4500
008			220216s9999 xx 000 0 und d
100			_aZhang Zhi-Shan
245		0	_aEffect of sand-stabilizing shrubs on soil respiration in a temperate desert
260			_bPlant and Soil _c2013
300			_a449-463
520			_aAims: Explore how soil CO2 efflux and its components change after moving sand dunes are stabilized with shrubs, and how abiotic factors affect those components at different scales. Methods: Soil CO2 efflux from a sand-stabilized area was compared to that from moving sand dunes in the tengger Desert. To partition rhizosphere respiration (RR) from soil basal respiration (RB), a root-isolation plot was established. Results:Compared to moving sand dunes, total soil respiration (RT) in the sand-stabilized area increased 3.2 fold to 0.28+-0.08 meu mol CO2 m-2 s-1, two third of which was from RB. Shrub patchiness produced spatial variation in soil respiration, whereas temporal dynamics of soil respiration were affected mainly by soil water content. Shallow soil water content (0- 20cm) influenced RT and RB, whereas deep soil water content (30-210 cm) influenced RR and the ratio RR/RT. During most of the year when soil water content was below field capacity, diurnal changes in soil respiration were partially decoupled from soil temperature and photosynthetic active radiation. Conclusion: Sand-dune stabilization increased soil respiration, and increased RB from biological soil crust and altered soil properties such as increased soil organic matter contributed more than increased RR from increased shrubs.
650			_aBiological soil crusts
650			_aRevegetation
650			_aRhizosphere respiration
650			_aSoil basal respiration
650			_aTengger Desert
700			_aGao Yan-Hong
700			_aHu Yi-Gang
700			_aHuang Lei
700			_aJia Rong-Liang
700			_aLi Xin-Rong
700			_aNowak SRobert
700			_aWu Pan
700			_aZhao Yang
942			_cJS
999			_c58103 _d58103