Soil Properties under Major Halophytic Vegetation Communities in Arid Regions
NAN Lili, GUO Quanen1. College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, Gansu, China; 2. College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, Gansu, China
Soil physical, chemical, and biological properties of seven desert halophytes (Kalidium foliatum, Achnatherum splendens, Leymus secalinus, Phragmites australis, Karelinia caspia, Tamarix ramosissima, Atriplex tatarica) were investigated in saline-sodic badlands of the Hexi Corridor, Gansu Province, China. The results showed that sampled soils were generally infertile and characterized by low levels of organic matter, available nitrogen, phosphorus, copper, manganese, and zinc as well as microbial communities with dominant bacteria supporting native desert halophytes. Available potassium and iron were sufficient in the study sites. With increasing soil layer depth, the concentrations of organic matter, available nitrogen, potassium, manganese, copper, bacteria, and actinomyces in the soil decreased significantly (P＜0.05), while the concentrations of moisture, available iron, and zinc in the soil increased significantly (P＜0.05). The contents of moisture, total salt, organic matter, available nitrogen, potassium, iron, manganese, zinc, copper, bacteria, and actinomyces showed significant seasonal variations (P＜0.05). All these variables except bacteria and actinomyces were the greatest in summer and the lowest in spring. The redundancy analysis revealed that total salt, organic matter, available potassium, and copper were posi-tively correlated with vegetation coverage. K. foliatum community was the constructive or dominant species in the desert community for the biological control of soil salinization.
 Li Y C. Land cover dynamic changes in Northern China: 1989-2003 [J]. Journal of Geographical Sciences, 2008, 18(1): 85-94.
 Kang S Z, Su X L, Tong L, et al. A warning from an ancient oasis: intensive human activities are leading to potential ecological and social catastrophe [J]. International Journal of Sustainable Development and World Ecology, 2008, 15(5): 440-447.
 Mathur N, Singh J, Bohra S, et al. Arbuscular mycorrhizal status of medicinal halophytes in saline areas of Indian Thar Desert [J]. International Journal of Soil Science, 2007, 2(2): 119-127.
 Gansu Provincial Soil Survey Office. Gansu Soil [M]. Bei-jing: China Agricultural Press, 1993(Ch).
 Karlen D L, Mausbach M J, Doran J W, et al. Soil quality: A concept, definition, and framework for evaluation [J]. Soil Science Society of America Journal, 1997, 61(1): 4-10.
 Eugène N N, Jacques E, Désiré T V, et al. Effects of some physical and chemical characteristics of soil on productivity and yield of cowpea (Vigna unguiculata L. Walp.) in coastal region (Cameroon) [J]. African Journal of Environmental Science & Technology, 2010, 4: 108-114.
 Pinho R C, Miller R P, Alfala S S. Agroforestry and the improvement of soil fertility: A view from Amazonia [J]. Applied and Environmental Soil Science, 2012, 2012(1): 1155- 1165.
 Zhang F R, An P, Wang J Y, et al. Soil quality criteria and methodologies of farmland grading[J]. Resources Science, 2002, 24(2): 71-75 (Ch).
 Wijesinghe D K, John E A, Hutchings M J. Does pattern of soil resource heterogeneity determine plant community structure? An experimental investigation [J]. Journal of Ecology, 2005, 93(1): 99-112.
 Bao S D. Soil Agricultural Chemistry Analysis. [M] 3rd Ed. Beijing: China Agriculture Press, 2000 (Ch).
 Xu G H. Microbial Analysis Methods Manual China [M]. Beijing: Agricultural Press, 1986 (Ch).
 Davy M C, Koen T B. Variations in the soil organic carbon for two soil types and six land uses in the Murray Catchment, New South Wales, Australia [J]. Soil Research, 2013, 51(8): 631-644.
 Peng F, Huang C H, Liao J, et al. Effect of Kalidium foliatum community on soil salinization [J]. Journal of Desert Re-search, 2015, 35(1): 90-93 (Ch).
 Marchetti A, Piccini C, Francaviglia R, et al. Spatial distribution of soil organic matter using geostatistics: A key indicator to assess soil degradation status in central Italy [J]. Pedosphere, 2012, 22(2): 230-242.
 Hammer E C, Nasr H, Pallon J, et al. Elemental composition of arbuscular mycorrhizal fungi at high salinity [J]. My-corrhiza, 2011, 21(2): 117-129.
 Kabata A, Pendias H. Trace Elements in Soils and Plants [M]. 3rd Ed. Boca Raton: CRC Press, 2001.
 Wang S Z, Wei X R, Hao M D. Dynamics and availability of different pools of manganese in semiarid soils as affected by cropping system and fertilization [J]. Pedosphere, 2016, 26(3): 351-361.
 Wei X R, Hao M D, Shao M A, et al. Changes in soil properties and the availability of soil micronutrients after 18 years of cropping and fertilization [J]. Soil & Tillage Research, 2006, 91(1-2): 120-130.
 State Environmental Protection Administration of China. Chinese Environmental Quality Standard for Soils (GB15618- 1995) [S]. Beijing: Standards Press of China, 1995(Ch).
 Antoniadis V, Robinson J S, Alloway B J. Effects of short-term pH fluctuations on cadmium, nickel, lead, and zinc availability to ryegrass in a sewage sludge-amended field [J]. Chemosphere, 2008, 71(4): 759-764.
 Chatterjee C, Agarwala S C, Sharma P N. Micronutrient status of principal soil types of Uttar Pradesh [J]. Geophytology, 1976, 6: 245-258.
 Wu C X, Fu H, Pei S F, et al. Study on the contents of available trace elements in different grassland soils on the western slope of the Helan Mountain [J]. Arid Zone Research, 2008, 25(1): 137-144 (Ch).
 Zahran H H, Moharram A M, Mohammad H A. Some eco-logical and physiological studies on bacteria isolated from salt-affected soils of Egypt [J]. Journal of Basic Microbiology, 1992, 32(6): 405-413.
 Hoyle F C, Murphy D V. Seasonal changes in microbial function and diversity associated with stubble retention versus burning [J]. Australian Journal of Soil Research, 2006, 44(4): 407-423.
 Stevenson F J. Humus Chemistry, Genesis, Composition, Reactions[M]. 2nd Ed. New York: John Wiley and Sons, 1994.
 Sutton P, Maskall J, Thornton I. Concentrations of major and trace elements in soil and grass at Shimba Hills National Reserve, Kenya [J]. Applied Geochemistry, 2002, 17(8): 1003-1016.