Crops ›› 2019, Vol. 35 ›› Issue (5): 76-81.doi: 10.16035/j.issn.1001-7283.2019.05.013

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Evaluation of Productivity and Quality of Wild Domestication Poa annua L. in Northern Tibet

Wei Wei1,Zhou Juanjuan1,Sang Dan1,Tenzin Tarchen1,Cui Yan2,Qin Aiqiong1   

  1. 1 State Key Laboratory of Highland Barley and Yak Germplasm Resources and Genetic Improvement/Institute of Pratacultural Science, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa 850000, Tibet, China
    2 Agriculture and Animal Husbandry Bureau of Aohan Banner, Chifeng of Inner Mongolia,Chifeng 024300, Inner Mongolia, China
  • Received:2019-02-27 Revised:2019-07-29 Online:2019-10-15 Published:2019-11-07
  • Contact: Aiqiong Qin

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Abstract:

In order to explore the approaches for alleviating forage shortage and grassland degradation in northern Tibet, this study carried out a domestication experiment with Poa litwinowiana, P. attenuata and P. crymophila, P. crymophila cv. Qinghai was the control, for screening the high-quality local Poa annua forage suitable for the alpine regions. Analyses and comparisons were made on the growth characteristics and nutritional quality of different experimental materials under field conditions at 4 512m elevation. The results showed that the above-ground biomass, plant height and neutral detergent fiber (NDF) and acid detergent fiber (ADF) of Poa annua were gradually increased, the crude protein (CP) and crude fat (CF) decreased with the prolongation of growth stage. The above-ground biomass of three wild Poa annua in the milk maturity stage was significantly higher (P<0.05) than that of the control; the order of root biomass was P. attenuata > P. litwinowiana > P. crymophila > P. crymophila cv. Qinghai. The CP content of P. crymophila was significantly higher (P<0.05) than that of P. attenuate, and ADF and NDF contents of P. attenuate was the lowest. The gray system theory of entropy weighting method was used to evaluate the productivity and nutrient quality of different Poa annua in milk maturity stage, the order was showed that P. attenuata > P. crymophila (wild species) > P. litwinowiana > P. crymophila cv. Qinghai (cultivated species).

Key words: Tibet Plateau, Poa annua L., Domestication and cultivation, Production performance, Nutritional quality

Table 1

Soil nutrients content of the experimental field"

指标
Index		 pH 有机质(%)
Organic matter		 全氮(g/kg)
Total N		 全磷(g/kg)
Total P		 全钾(g/kg)
Total K		 碱解氮(mg/kg)
Alkaline hydrolysis N		 速效磷(mg/kg)
Available P		 速效钾(mg/kg)
Available K
测定值Measured value 7.85 0.24 2.37 0.68 3.91 78.52 19.14 217.81

Table 2

Profile of seeds collecting plots"

编号
Number		 材料名称
Material name		 采集地经纬度
Collecting plot longitude and latitude		 海拔 (m)
Altitude		 所属地区
Belong to area
CK 青海冷地早熟禾（P. crymophila cv. Qinghai） - - 海南州同德县
P-1 中亚早熟禾（P. litwinowiana） N 29°53′E 92°30′ 4 200 那曲市巴青县
P-2 渐尖早熟禾（P. attenuata） N 31°08′E 92°12′ 4 500 那曲市那曲县
P-3 冷地早熟禾（P. crymophila） N 32°03′E 92°17′ 4 800 那曲市聂荣县

Table 3

Above-ground biomass, plant height, panicle length and root biomass variation at different growth stages of four materials"

编号Number 拔节期Jointing stage 抽穗期Heading stage 乳熟期Milky maturity stage
地上生物量Above-ground biomass (g/m2) CK 15.56±2.27a 26.37±0.44c 67.50±4.33b
P-1 15.94±2.21a 27.22±1.37bc 85.46±9.49a
P-2 16.49±3.40a 32.36±2.60ab 88.29±5.17a
P-3 15.09±1.43a 36.87±4.66a 88.74±6.12a
株高Plant height (cm) CK 6.64±1.43b 11.30±1.69c 25.38±3.86a
P-1 8.74±0.92a 13.14±2.92bc 27.40±5.90a
P-2 5.58±1.03b 13.34±1.85b 21.50±6.10b
P-3 6.11±1.27b 17.58±1.57a 25.31±5.25a
穗长Panicle length (cm) CK - - 4.76±0.23ab
P-1 - - 5.29±0.29a
P-2 - - 4.12±0.19b
P-3 - - 4.26±0.36b
根系生物量Root biomass(g/m2) CK - - 216.93±11.09b
P-1 - - 270.04±31.70a
P-2 - - 301.65±21.15a
P-3 - - 229.20±17.06b

Fig.1

The crude protein, acid detergent fiber, neutral detergent fiber and crude fat contents at different growth stages of four materials Different lowercase letters in the same growth stage indicate significant difference (P<0.05)"

Table 4

RFV at different growth stages of tested Poa annua"

生育期Growth stage CK P-1 P-2 P-3
拔节期Jointing stage 110.83 111.06 122.97 110.85
抽穗期Heading stage 106.14 100.34 113.29 103.64
乳熟期Milky maturity stage 81.47 82.63 98.49 81.47

Table 5

"Optimal varieties" and index weights"

株高
Plant height		 干草产量
Hay yield		 粗蛋白含量
Crude protein
content		 酸性洗涤纤维含量
Acid detergent
fiber content		 中性洗涤纤维含量
Neutral detergent
fiber content		 粗脂肪含量
Crude fat
content		 相对饲
用价值
RFV
X0 27.4000 88.7400 9.4700 55.8300 38.2300 3.8900 98.4900
熵值Entropy 0.7675 0.7704 0.7727 0.7736 0.7704 0.7729 0.7718
权重Weight 0.1452 0.1434 0.1420 0.1414 0.1434 0.1419 0.1426

Table 6

Coefficient of correlation values of different measurement indexes"

编号
Number		 株高
Plant height		 干草产量
Hay yield		 粗蛋白含量
Crude protein
content		 酸性洗涤纤维含量
Acid detergent
fiber content		 中性洗涤纤维含量
Neutral detergent
fiber content		 粗脂肪含量
Crude fat
content		 相对饲
用价值
RFV
CK 0.6944 0.4116 0.6485 0.8089 0.4368 1.0000 0.4922
P-1 1.0000 0.8191 0.6134 0.8089 0.4549 0.6873 0.5099
P-2 0.3333 0.9706 0.5249 1.0000 1.0000 0.5611 1.0000
P-3 0.6871 1.0000 1.0000 0.8452 0.4262 0.5953 0.4922

Table 7

Correlation modulus and ranking of tested Poa annua"

编号
Number		 等权关联度
Correlation modulus of
same weight		 等权关联度排序
Order of correlation
modulus of same weight		 加权关联度
Correlation modulus
of weight		 加权关联度排序
Order of correlation modulus of weight
CK 0.6411 4 0.6418 4
P-1 0.6697 3 0.6991 3
P-2 0.7692 1 0.7700 1
P-3 0.7206 2 0.7209 2
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