title: An Experimental Comparison of Two Methods on Photosynthesis Driving Soil Respiration: Girdling and Defoliation.
abstract: Previous studies with different experimental methods have demonstrated that photosynthesis significantly influences soil respiration (RS). To compare the experimental results of different methods, RS after girdling and defoliation was measured in five-year-old seedlings of Fraxinus mandshurica from June to September. Girdling and defoliation significantly reduced RS by 33% and 25% within 4 days, and 40% and 32% within the entire treatment period, respectively. The differential response of RS to girdling and defoliation was a result of the over-compensation for RS after girdling and redistribution of stored carbon after defoliation. No significant effect on RS was observed between girdling and defoliation treatment, while the soluble sugar content in fine roots was higher in defoliation than in girdling treatment, indicating that defoliation had less compensation effect for RS after interrupting photosynthates supply. We confirm the close coupling of RS with photosynthesis and recommend defoliation for further studies to estimate the effect of photosynthesis on RS.
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China; Shenyang Agricultural University, Shenyang, China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Jing
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Dexin
authors.initials: D
authors.lastname: Guan
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Jiabing
authors.initials: J
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Anzhi
authors.initials: A
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Changjie
authors.initials: C
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Fenghui
authors.initials: F
authors.lastname: Yuan
mesh_terms: D000704:Analysis of Variance; D018533:Biomass; D002241:Carbohydrates / Q000032:analysis; D019069:Cell Respiration; D002940:Circadian Rhythm / Q000502:physiology; D065928:Forests; D031661:Fraxinus / Q000502:physiology*; D010788:Photosynthesis; D010827:Physiology / Q000379:methods*; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D012995:Solubility; D013213:Starch / Q000032:analysis; D013696:Temperature
chemical_list: D002241:Carbohydrates; D012987:Soil; D013213:Starch