Role of different types of protective forest stands in fodder productivity of rangeland in the Western Caspian region

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Abstract

Forest pastures with different tree crown cover were studied. The seasonal dynamics of the yield and nutritional value of grass and twig-leaf fodder of forest pasture was studied. The unsystematic use of pastures in arid territories has increased the process of degradation and has become one of the factors of depletion of their natural vegetation. The use of forest reclamation in the 70s and 90s on sandy lands and pastures in the Western Caspian region made it possible to create significant areas of forest pasture land with strip and massive stands of Ulmus pumila L. and Robinia pseudoacacia L. Different types of tree stands created on pastures not only improve the microclimate and form a comfortable environment for grazing animals, but also are an additional source of valuable twig feed. The aim of the research was to study forage productivity of forest pastures with different types of plantings on the sands of the Western Caspian region. The objects of the research were forest pastures with different species composition and tree crown cover. Studies on the forage productivity of forest-reclaimed pastures were conducted in 2018-2020 on the basis of the North Caucasus branch of Federal Scientific Centre of Agroecology, Complex Melioration and Protective Af-forestation of the Russian Academy of Sciences. The research was based on field experiments and laboratory analyses. According to the results of the study, forest-reclaimed pastures with unsystematic grazing had 1.5…2-fold increase in productivity compared to natural ones. The largest amount of twig-leaf feed was formed in broad-band Robinia stands in summer-autumn period. The total gross stock of natural pastures of the Western Caspian region did not exceed 0.3…0.4 t/ha of dry weight, the consumed stock was 0.2…0.3 t/ha. With the help of strip and massive plantings on degraded pasture lands, it is possible to increase significantly their productivity and quality with the achievement of 7 MJ of exchange energy and 0.26…0.29 feed units in 1 kg of elm and robinia twig-leaf feed during droughts.

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Table 1. Taxation characteristics of tree plantations on sandy soils of Western Caspian Region

Species composition

Number  of trees

Distance between trees  in a row, m

Tree  height, m

Barrel diameter, m

Crown lifting

height, m

Tree crown cover

general

in a row

Broad-band plantings

Ulmus

515

5.8

7.0

9.4

1.3

0.8

0.6

Robinia

394

7.1

5.5

10.5

1.4

0.7

0.6

Narrow-band plantings

Ulmus

265

4.8

11.9

21.7

1.5

0.4

0.5

Robinia

310

4.8

6.0

13.8

1.3

0.2

0.8

Savanna plantings

Ulmus

76

40.0

9.7

23.4

1.2

0.1

Robinia

110

27.0

6.3

19.3

1.1

0.1

Table 2. Feed productivity of twig-leaf mass of Ulmus pumila and Robinia pseudoacacia plantings from a height of 1.2…1.7 m

Type of pasture / tree species

Feed productivity, kg/ha

Mass of leaves and twigs with a diameter of 1 mm

Branches

Spring

Summer

Autumn

Spring

Summer

Autumn

Green mass

Dry weight

Green mass

Dry weight

Green mass

Dry weight

Dry weight

Broad-band plantings

Ulmus

69.9

63.3

171.5

126.2

186.5

136.8

0.07

0.89

77.3

Robinia

55.3

48.5

131.2

96.5

252.3

142.7

0.08

0.10

22.1

Narrow-band plantings

Ulmus

36.1

32.6

88.2

64.9

102.0

74.3

0.09

0.11

16.4

Robinia

42.1

38.1

103.2

75.9

146.5

108.4

0.10

0.12

15.5

Savanna plantings

Ulmus

10.3

9.3

25.3

18.6

24.5

50.3

0.04

0.07

8.4

Robinia

14.9

13.5

36.6

27.0

90.6

68.0

0.02

0.04

13.2

LSD05 Ulmus green mass = 63 kg/ha Ff = 14.7 > Ft = 6.9

LSD05 Robinia green mass = 75 kg/ha Ff = 6.6 < Ft = 6.9

Dynamics of grass yield on different types of forest pastures, t/ha

Table 3. Chemical composition of forage from pastures in the Western Caspian region, 2020

Feed type

Content of raw organic substances in 1 kg of feed of natural moisture,%

Protein

Fat

Fiber

NFE

Ash

Woody

18.41

5.10

17.93

65.19

13.45

Ulmus pumila

Robinia pseudoacacia

22.94

4.96

21.62

61.66

7.10

Herbaceous

11.50

2.62

34.73

20.76

10.76

Setaria pumila 80 %+ Poa bulbosa 15 % + Bromus secalinus 5 %

Table 4. Feed value of forage from pastures of the Western Caspian region, 2020

Feed type

Content in 1 kg of feed of natural moisture

Content in 1 kg  of air-dried feed

Feed
units
Exchange
energy,
MJ
Digested
protein, g
Carotene,
mg

Macronutrients, g

Ca

P

Woody

0.29

3.7

35.18

35

5.6

0.8

Robinia pseudoacacia

Ulmus pumila

0.26

3.3

25.64

31

3.4

0.7

Herbaceous

0.24

4.8

36.45

27

8.7

1.2

Setaria pumila 80 %+ Poa bulbosa 15 % + Bromus secalinus 5 %

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About the authors

Ludmila P. Rybashlykova

Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy of Sciences

Author for correspondence.
Email: ludda4ka@mail.ru
ORCID iD: 0000-0002-3675-6243

Candidate of Agricultural Sciences, Leading researcher, Laboratory of protective afforestation and phytomelioration of low-yielding lands

97 Universitetsky av., Volgograd, 400062, Russian Federation

Svetlana N. Sivceva

North Caucasian branch of the Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy of Sciences

Email: achikylak356890@mail.ru
ORCID iD: 0000-0003-1068-2677

Researcher

12 Proletarskaya st., Achikulak vill., Neftekumsky district, Stavropol Territory, 356890, Russian Federation

Tatyana F. Mahovikova

Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy of Sciences

Email: achikylak356890@mail.ru
ORCID iD: 0000-0001-6316-6866

Researcher

12 Proletarskaya st., Achikulak vill., Neftekumsky district, Stavropol Territory, 356890, Russian Federation

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Supplementary files

Supplementary Files
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1. Dynamics of grass yield on different types of forest pastures, t/ha

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Copyright (c) 2021 Rybashlykova L.P., Sivceva S.N., Mahovikova T.F.

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