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Acta Agronomica Sinica ›› 2018, Vol. 44 ›› Issue (11): 1725-1732.doi: 10.3724/SP.J.1006.2018.01725

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Planting Years on the Root System and Soil Environment of Lycium barbarum L.

Sheng-Rong XU1,3,En-He ZHANG1,*(),Rui-Li MA1,3,Qi WANG2,Qing-Lin LIU1,Jia-Jia CUI1   

  1. 1 College of Agronomy, Gansu Agricultural University, Lanzhou 730070, Gansu, China
    2 College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, Gansu, China
    3 Northwest Institute of Plateau Biology, Chinese Academy of Sciences / Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Xining 810008, Qinghai, China
  • Received:2017-10-16 Accepted:2018-08-20 Online:2018-11-12 Published:2018-09-06
  • Contact: En-He ZHANG E-mail:zhangeh@gsau.edu.cn
  • Supported by:
    The study was supported by the National Natural Science Foundation of China(31560380);the Open Project of Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources Grant(2017-ZJ-Y10)

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Abstract:

In order to clarify the dynamic change of root system, in Lycium barbarum L., a main commercial crop distributed in arid land of northwestern China, and soil environment under different planting-years, physiological characteristic of root system, soil enzyme activity, organic carbon, soil microbial quantity and diversity, physical and chemical properties of the rhizosphere soil were monitored for ‘Ningqi 1’ seedlings for five treatments, different continuous cropping years (1, 3, 5, 7, and 10 years). With the increase of planting fixed number of years, the special hydraulic conductivity of roots (Ks, root) increased first and then decreased, the activity of roots remarkably decreased, the relative electric conductivity of roots gradually increased, the relative electric conductivity of root system began to decrease after planting seven years, but the reduction was not significant. The average moisture content of the soil 0-150 cm deep increased in the first five years, and declined after the planting five years, in particular, showed more effect to soil moisture above 60 cm deep. The average soil average porosity in 0-100 cm layer decreased with the increase of planting fixed number of years; the amount of soil rhizosphere microorganism increased, in this case, the number of soil bacteria and fungi increased, and the number of actinomyces did not have significant changes The soil rhizosphere microorganism average well color development (AWCD) decreased with the increase of planting fixed number of years, Shannon index (H) and Richness index (S) decreased firstly and then increased. The soil total organic carbon (TOC) activity decreased with the increase of planting fixed number of years, although light fraction organic carbon (LFOC) activity of planting five years and dissolved organic carbon (DOC) activity of planting seven years had slight rise, their general trend was consistent. The soil dehydrogenase activity was relatively stable, there was no significant change, the soil phosphatase activity increased, urease, catalase, polyphenol oxidase, and sucrase activity had similar changing trend, all of them decreasing first and then increasing. These results suggest that soil activity, fertility and microorganism diversity are decreased with the increase of planting fixed number of years, the toxic effect of soil microenvironment on the biological activity of root system in increased, meanwhile, the root system activity, hydraulic conductivity and water efficiency of soil are decreased by the changes of root system living environment.

Key words: Lycium barbarum L., soil enzyme, soil microorganism, organic carbon, root system

Table 1

Effect of planting years on root physicochemical properties in Lycium barbarum L."

种植年限
Planting year		 根系比导率
Specific conductivity of root (Ks,root) (kg MPa-1 m-2 s-1)		 根系活力
Activity of root
(μg g-1 h-1)		 根系相对电导率
Relative electric conductivity of root (%)
1年 One year 1.32±0.125 b 482.3±34.5 a 29.4±1.39 d
3年 Three years 1.49±0.201 a 451.7±19.1 b 34.9±2.56 c
5年 Five years 1.40±0.093 ab 449.2±27.3 b 35.7±2.62 bc
7年 Seven years 1.25±0.119 b 426.9±20.5 c 36.9±3.29 a
10年 Ten years 1.16±0.241 c 419.3±14.4 c 36.6±2.84 a

Fig. 1

Space distribution of soil porosity (A) and soil moisture content (B) under different planting years"

Table 2

Effect of planting years on rhizosphere soil microbial population and diversity in Lycium barbarum L."

种植年限
Planting year		 细菌
Bacterium
(×106 CFU g-1)		 真菌
Fungi
(×106 CFU g-1)		 放线菌Actinomyces
(×106 CFU g-1)		 微生物总量Total
(×106 CFU g-1)		 平均颜色
变化率
AWCD		 香浓指数Shannon index (H) 丰富度指数
Richness index (S)
1年 One year 28.37±1.31 d 3.99±0.19 d 5.27±0.26 b 37.63±1.47 c 0.78 a 3.13 a 27 a
3年 Three years 30.95±0.93 c 4.83±0.23 c 4.73±0.16 c 40.51±1.14 b 0.73 ab 3.11 a 26 a
5年 Five years 35.16±2.09 a 5.26±0.11 b 5.98±0.24 a 46.40±2.31 a 0.68 b 2.96 b 21 b
7年 Seven years 32.81±1.52 b 6.72±0.21 a 5.16±0.15 b 44.69±1.80 a 0.66 b 3.05 ab 24 a
10年 Ten years 30.19±0.45 c 6.53±0.25 a 5.62±0.17 ab 42.14±0.99 b 0.65 b 3.03 ab 23 ab

Fig. 2

Total organic carbon (TOC), particulate organic carbon (POC), readily oxidizable organic carbon (ROC), light fraction organic carbon (LFOC), dissolved organic carbon (DOC), and microbial biomass organic carbon (MBC) content under different planting years"

Fig. 3

Effect of planting years on rhizosphere soil enzyme activity in Lycium barbarum L."

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