Addition of HPMA affects seed germination, plant growth and properties of heavy saline-alkali soil in northeastern China: comparison with other agents and determination of the mechanism

Abstract

China has a large area of inland salinealkali land, equivalent to 40% of the total cultivated land in the country. The principal features of these lands are high salt content, high pH, and poor soil structure with low water infiltration and poor drainage. These conditions effectively prevent the exploitation of such land for agriculture.

Glomalin contributed more to carbon, nutrients in deeper soils, and differently associated with climates and soil properties in vertical profiles

“…In China, the grain production in Songnen Plain accounts for over 10% of total commercial grain output in China 54 , owing to fertile black soils in this region 55,56 . However, soil degradation restricts agricultural development 57,58 as shown be a 50% reduction in SOM and soil fertility 59 , serious saline-alkalinization 60 and soil physical degradation of soil bulk density increase and decrease of total porosity 50 . The following suggestions for northeastern China farmland development could be proposed based on the results of this study.…”

“…At present, a total of 3.73 million hm 2 saline-sodic lands distributes in the Songnen Plain and saline-alkalization becomes more serious under global warming process in this region 66 . Anti-measures to decline the processes of saline-alkalization will benefit the accumulation of glomalin in soils, such as anti-agent additions 60 or suitable species selections for acidifying soils 67 .…”

Effects of different amendments for the reclamation of coastal saline soil on soil nutrient dynamics and electrical conductivity responses

“…Microbial metabolites can dissolve organic components as well as assimilate ions, which alters soil conductivity. Furthermore, the addition of organic amendments results in higher soil permeability (Tejada and Gonzalez, 2003, 2004Wang et al, 2011;Yazdanpanah et al, 2011;Sun et al, 2013), which in turn reduces evaporation and salt content at the soil surface and is conducive to plant germination (Haisheng et al, 2008).…”

Discovery of two novel highly tolerant NaHCO3 Trebouxiophytes: Identification and characterization of microalgae from extreme saline–alkali soil

“…In northeast China, large-scale tree clear-cuts and subsequent intensive grazing have induced soil erosion and increased evapotranspiration, resulting in salt accumulation from groundwater on the soil surface [1,2]. The Songnen Plain, located between N42°30′-51°20′ and E121°40′-128°30′, is an alkalinized-salinized grassland that covers about 23,926 km 2 [3].…”